21640464630510 has 64 divisors (see below), whose sum is σ = 58486370125824. Its totient is φ = 5076941846400.

The previous prime is 21640464630503. The next prime is 21640464630593. The reversal of 21640464630510 is 1503646404612.

It is a Curzon number.

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, 1057685989 + ... + 1057706448.

It is an arithmetic number, because the mean of its divisors is an integer number (913849533216).

Almost surely, 2^{21640464630510} is an apocalyptic number.

21640464630510 is an abundant number, since it is smaller than the sum of its proper divisors (36845905495314).

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

21640464630510 is a wasteful number, since it uses less digits than its factorization.

21640464630510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2115392489.

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 21640464630510 in words is "twenty-one trillion, six hundred forty billion, four hundred sixty-four million, six hundred thirty thousand, five hundred ten".