21061797 has 8 divisors (see below), whose sum is σ = 28172256. Its totient is φ = 13996272.

The previous prime is 21061783. The next prime is 21061819. The reversal of 21061797 is 79716012.

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

It is not a de Polignac number, because 21061797 - 2⁷ = 21061669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061717) 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, 10123 + ... + 12024.

It is an arithmetic number, because the mean of its divisors is an integer number (3521532).

Almost surely, 2^21061797 is an apocalyptic number.

It is an amenable number.

21061797 is a deficient number, since it is larger than the sum of its proper divisors (7110459).

21061797 is a wasteful number, since it uses less digits than its factorization.

21061797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22467.

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 21061797 is about 4589.3133473320. The cubic root of 21061797 is about 276.1627768009.

The spelling of 21061797 in words is "twenty-one million, sixty-one thousand, seven hundred ninety-seven".