1621373611231 has 12 divisors (see below), whose sum is σ = 1798521201400. Its totient is φ = 1460453282640.

The previous prime is 1621373611229. The next prime is 1621373611241. The reversal of 1621373611231 is 1321163731261.

It is not a de Polignac number, because 1621373611231 - 2¹ = 1621373611229 is a prime.

It is a super-2 number, since 2×1621373611231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621373611211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61453701 + ... + 61480078.

Almost surely, 2^{1621373611231} is an apocalyptic number.

1621373611231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1621373611231 is a deficient number, since it is larger than the sum of its proper divisors (177147590169).

1621373611231 is a wasteful number, since it uses less digits than its factorization.

1621373611231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122933910 (or 122933899 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The spelling of 1621373611231 in words is "one trillion, six hundred twenty-one billion, three hundred seventy-three million, six hundred eleven thousand, two hundred thirty-one".