1621125816132 has 96 divisors (see below), whose sum is σ = 3945946636800. Its totient is φ = 517551724800.

The previous prime is 1621125816131. The next prime is 1621125816157. The reversal of 1621125816132 is 2316185211261.

It is not an unprimeable number, because it can be changed into a prime (1621125816131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21413907 + ... + 21489477.

It is an arithmetic number, because the mean of its divisors is an integer number (41103610800).

Almost surely, 2^{1621125816132} is an apocalyptic number.

1621125816132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1621125816132 is an abundant number, since it is smaller than the sum of its proper divisors (2324820820668).

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

1621125816132 is a wasteful number, since it uses less digits than its factorization.

1621125816132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76417 (or 76415 counting only the distinct ones).

The product of its digits is 34560, while the sum is 39.

The spelling of 1621125816132 in words is "one trillion, six hundred twenty-one billion, one hundred twenty-five million, eight hundred sixteen thousand, one hundred thirty-two".