21021333125140 has 48 divisors (see below), whose sum is σ = 44592681304080. Its totient is φ = 8323262796800.

The previous prime is 21021333125087. The next prime is 21021333125153. The reversal of 21021333125140 is 4152133312012.

It can be written as a sum of positive squares in 8 ways, for example, as 2687881554576 + 18333451570564 = 1639476^2 + 4281758^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21021333125099 and 21021333125108.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7089696 + ... + 9607624.

It is an arithmetic number, because the mean of its divisors is an integer number (929014193835).

Almost surely, 2^{21021333125140} is an apocalyptic number.

21021333125140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021333125140 is an abundant number, since it is smaller than the sum of its proper divisors (23571348178940).

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

21021333125140 is a wasteful number, since it uses less digits than its factorization.

21021333125140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522172 (or 2522170 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 21021333125140 its reverse (4152133312012), we get a palindrome (25173466437152).

The spelling of 21021333125140 in words is "twenty-one trillion, twenty-one billion, three hundred thirty-three million, one hundred twenty-five thousand, one hundred forty".