21056655245 has 16 divisors (see below), whose sum is σ = 25516228608. Its totient is φ = 16680343680.

The previous prime is 21056655229. The next prime is 21056655253. The reversal of 21056655245 is 54255665012.

It is not a de Polignac number, because 21056655245 - 2⁴ = 21056655229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299012 + ... + 362658.

It is an arithmetic number, because the mean of its divisors is an integer number (1594764288).

Almost surely, 2^21056655245 is an apocalyptic number.

It is an amenable number.

21056655245 is a deficient number, since it is larger than the sum of its proper divisors (4459573363).

21056655245 is a wasteful number, since it uses less digits than its factorization.

21056655245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64300.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 21056655245 in words is "twenty-one billion, fifty-six million, six hundred fifty-five thousand, two hundred forty-five".