21601020524 has 6 divisors (see below), whose sum is σ = 37801785924. Its totient is φ = 10800510260.

The previous prime is 21601020499. The next prime is 21601020541. The reversal of 21601020524 is 42502010612.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21601020524.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2700127562 + ... + 2700127569.

It is an arithmetic number, because the mean of its divisors is an integer number (6300297654).

Almost surely, 2^21601020524 is an apocalyptic number.

It is an amenable number.

21601020524 is a deficient number, since it is larger than the sum of its proper divisors (16200765400).

21601020524 is a wasteful number, since it uses less digits than its factorization.

21601020524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5400255135 (or 5400255133 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The spelling of 21601020524 in words is "twenty-one billion, six hundred one million, twenty thousand, five hundred twenty-four".