21076897655 has 32 divisors (see below), whose sum is σ = 27895684608. Its totient is φ = 15160048000.

The previous prime is 21076897637. The next prime is 21076897669. The reversal of 21076897655 is 55679867012.

It is not a de Polignac number, because 21076897655 - 2²⁶ = 21009788791 is a prime.

It is a super-2 number, since 2×21076897655² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21076897655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7258934 + ... + 7261836.

It is an arithmetic number, because the mean of its divisors is an integer number (871740144).

Almost surely, 2^21076897655 is an apocalyptic number.

21076897655 is a deficient number, since it is larger than the sum of its proper divisors (6818786953).

21076897655 is a wasteful number, since it uses less digits than its factorization.

21076897655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327.

The product of its (nonzero) digits is 6350400, while the sum is 56.

The spelling of 21076897655 in words is "twenty-one billion, seventy-six million, eight hundred ninety-seven thousand, six hundred fifty-five".