21209932789936 has 80 divisors (see below), whose sum is σ = 44889856329600. Its totient is φ = 9628028467200.

The previous prime is 21209932789883. The next prime is 21209932789937. The reversal of 21209932789936 is 63998723990212.

It is a super-2 number, since 2×21209932789936² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21209932789937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1736946871 + ... + 1736959081.

It is an arithmetic number, because the mean of its divisors is an integer number (561123204120).

Almost surely, 2^{21209932789936} is an apocalyptic number.

It is an amenable number.

21209932789936 is an abundant number, since it is smaller than the sum of its proper divisors (23679923539664).

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

21209932789936 is a wasteful number, since it uses less digits than its factorization.

21209932789936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24578 (or 24572 counting only the distinct ones).

The product of its (nonzero) digits is 158723712, while the sum is 70.

The spelling of 21209932789936 in words is "twenty-one trillion, two hundred nine billion, nine hundred thirty-two million, seven hundred eighty-nine thousand, nine hundred thirty-six".