21640544510 has 64 divisors (see below), whose sum is σ = 42764198400. Its totient is φ = 7835812992.

The previous prime is 21640544489. The next prime is 21640544521. The reversal of 21640544510 is 1544504612.

It is a super-2 number, since 2×21640544510² (a number of 21 digits) contains 22 as substring.

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, 3363917 + ... + 3370343.

It is an arithmetic number, because the mean of its divisors is an integer number (668190600).

Almost surely, 2^21640544510 is an apocalyptic number.

21640544510 is a deficient number, since it is larger than the sum of its proper divisors (21123653890).

21640544510 is a wasteful number, since it uses less digits than its factorization.

21640544510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6945.

The product of its (nonzero) digits is 19200, while the sum is 32.

The spelling of 21640544510 in words is "twenty-one billion, six hundred forty million, five hundred forty-four thousand, five hundred ten".