21640541526524 has 12 divisors (see below), whose sum is σ = 40098650475744. Its totient is φ = 10183784247744.

The previous prime is 21640541526509. The next prime is 21640541526553. The reversal of 21640541526524 is 42562514504612.

It is a super-2 number, since 2×21640541526524² (a number of 27 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 3 ways as a sum of consecutive naturals, for example, 159121628804 + ... + 159121628939.

It is an arithmetic number, because the mean of its divisors is an integer number (3341554206312).

Almost surely, 2^{21640541526524} is an apocalyptic number.

It is an amenable number.

21640541526524 is a deficient number, since it is larger than the sum of its proper divisors (18458108949220).

21640541526524 is a wasteful number, since it uses less digits than its factorization.

21640541526524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318243257764 (or 318243257762 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 47.

The spelling of 21640541526524 in words is "twenty-one trillion, six hundred forty billion, five hundred forty-one million, five hundred twenty-six thousand, five hundred twenty-four".