21021120195736 has 32 divisors (see below), whose sum is σ = 41646806150400. Its totient is φ = 9919511972640.

The previous prime is 21021120195599. The next prime is 21021120195737. The reversal of 21021120195736 is 63759102112012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021120195737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262881780 + ... + 262961731.

It is an arithmetic number, because the mean of its divisors is an integer number (1301462692200).

Almost surely, 2^{21021120195736} is an apocalyptic number.

It is an amenable number.

21021120195736 is a deficient number, since it is larger than the sum of its proper divisors (20625685954664).

21021120195736 is a wasteful number, since it uses less digits than its factorization.

21021120195736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525843799 (or 525843795 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The spelling of 21021120195736 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, one hundred ninety-five thousand, seven hundred thirty-six".