21641057610 has 16 divisors (see below), whose sum is σ = 51938538336. Its totient is φ = 5770948688.

The previous prime is 21641057609. The next prime is 21641057621. The reversal of 21641057610 is 1675014612.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360684264 + ... + 360684323.

It is an arithmetic number, because the mean of its divisors is an integer number (3246158646).

Almost surely, 2^21641057610 is an apocalyptic number.

21641057610 is an abundant number, since it is smaller than the sum of its proper divisors (30297480726).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21641057610 is a wasteful number, since it uses less digits than its factorization.

21641057610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721368597.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21641057610 in words is "twenty-one billion, six hundred forty-one million, fifty-seven thousand, six hundred ten".