21610897 has 32 divisors (see below), whose sum is σ = 28283904. Its totient is φ = 16027200.

The previous prime is 21610889. The next prime is 21610907. The reversal of 21610897 is 79801612.

It is a happy number.

It is not a de Polignac number, because 21610897 - 2³ = 21610889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21610807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201918 + ... + 202024.

It is an arithmetic number, because the mean of its divisors is an integer number (883872).

Almost surely, 2^21610897 is an apocalyptic number.

It is an amenable number.

21610897 is a deficient number, since it is larger than the sum of its proper divisors (6673007).

21610897 is a wasteful number, since it uses less digits than its factorization.

21610897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21610897 is about 4648.7521981710. The cubic root of 21610897 is about 278.5421549152.

The spelling of 21610897 in words is "twenty-one million, six hundred ten thousand, eight hundred ninety-seven".