21054101 has 8 divisors (see below), whose sum is σ = 21296184. Its totient is φ = 20813760.

The previous prime is 21054067. The next prime is 21054119. The reversal of 21054101 is 10145012.

It can be written as a sum of positive squares in 4 ways, for example, as 3422500 + 17631601 = 1850^2 + 4199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21054101 - 2⁶ = 21054037 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52835 + ... + 53231.

It is an arithmetic number, because the mean of its divisors is an integer number (2662023).

Almost surely, 2^21054101 is an apocalyptic number.

It is an amenable number.

21054101 is a deficient number, since it is larger than the sum of its proper divisors (242083).

21054101 is a wasteful number, since it uses less digits than its factorization.

21054101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21054101 is about 4588.4748010641. The cubic root of 21054101 is about 276.1291359922.

Adding to 21054101 its reverse (10145012), we get a palindrome (31199113).

The spelling of 21054101 in words is "twenty-one million, fifty-four thousand, one hundred one".