21610897955 has 8 divisors (see below), whose sum is σ = 26044379712. Its totient is φ = 17214516928.

The previous prime is 21610897949. The next prime is 21610897999. The reversal of 21610897955 is 55979801612.

It is a happy number.

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 21610897955 - 2⁸ = 21610897699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21610897897 and 21610897906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9273899 + ... + 9276228.

It is an arithmetic number, because the mean of its divisors is an integer number (3255547464).

Almost surely, 2^21610897955 is an apocalyptic number.

21610897955 is a deficient number, since it is larger than the sum of its proper divisors (4433481757).

21610897955 is a wasteful number, since it uses less digits than its factorization.

21610897955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18550365.

The product of its (nonzero) digits is 1360800, while the sum is 53.

The spelling of 21610897955 in words is "twenty-one billion, six hundred ten million, eight hundred ninety-seven thousand, nine hundred fifty-five".