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21061597 = 149141353
BaseRepresentation
bin101000001010…
…1111111011101
31110122001002011
41100111333131
520342432342
62031231221
7344010034
oct120257735
943561064
1021061597
1110985987
127078511
1344956ab
142b2371b
151cb0717
hex1415fdd

21061597 has 4 divisors (see below), whose sum is σ = 21203100. Its totient is φ = 20920096.

The previous prime is 21061591. The next prime is 21061603. The reversal of 21061597 is 79516012.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21061591) and next prime (21061603).

It can be written as a sum of positive squares in 2 ways, for example, as 9865881 + 11195716 = 3141^2 + 3346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21061597 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70528 + ... + 70825.

It is an arithmetic number, because the mean of its divisors is an integer number (5300775).

Almost surely, 221061597 is an apocalyptic number.

It is an amenable number.

21061597 is a deficient number, since it is larger than the sum of its proper divisors (141503).

21061597 is a wasteful number, since it uses less digits than its factorization.

21061597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141502.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 21061597 is about 4589.2915575282. The cubic root of 21061597 is about 276.1619026633.

The spelling of 21061597 in words is "twenty-one million, sixty-one thousand, five hundred ninety-seven".

Divisors: 1 149 141353 21061597