21603223635536 has 40 divisors (see below), whose sum is σ = 41909185586880. Its totient is φ = 10787951252736.

The previous prime is 21603223635451. The next prime is 21603223635571. The reversal of 21603223635536 is 63553632230612.

It is a congruent 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, 478146995 + ... + 478192173.

It is an arithmetic number, because the mean of its divisors is an integer number (1047729639672).

Almost surely, 2^{21603223635536} is an apocalyptic number.

It is an amenable number.

21603223635536 is a deficient number, since it is larger than the sum of its proper divisors (20305961951344).

21603223635536 is a wasteful number, since it uses less digits than its factorization.

21603223635536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82323 (or 82317 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 47.

The spelling of 21603223635536 in words is "twenty-one trillion, six hundred three billion, two hundred twenty-three million, six hundred thirty-five thousand, five hundred thirty-six".