138056051221 has 12 divisors (see below), whose sum is σ = 159734276800. Its totient is φ = 118899946440.

The previous prime is 138056051209. The next prime is 138056051227. The reversal of 138056051221 is 122150650831.

It is not a de Polignac number, because 138056051221 - 2¹⁵ = 138056018453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138056051227) 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, 30022941 + ... + 30027538.

Almost surely, 2^138056051221 is an apocalyptic number.

138056051221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138056051221 is a deficient number, since it is larger than the sum of its proper divisors (21678225579).

138056051221 is a wasteful number, since it uses less digits than its factorization.

138056051221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60050520 (or 60050509 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The spelling of 138056051221 in words is "one hundred thirty-eight billion, fifty-six million, fifty-one thousand, two hundred twenty-one".