137860021 has 32 divisors (see below), whose sum is σ = 163658880. Its totient is φ = 114960384.

The previous prime is 137860013. The next prime is 137860057. The reversal of 137860021 is 120068731.

It is a cyclic number.

It is not a de Polignac number, because 137860021 - 2³ = 137860013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137860001) 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, 845686 + ... + 845848.

It is an arithmetic number, because the mean of its divisors is an integer number (5114340).

Almost surely, 2^137860021 is an apocalyptic number.

It is an amenable number.

137860021 is a deficient number, since it is larger than the sum of its proper divisors (25798859).

137860021 is a wasteful number, since it uses less digits than its factorization.

137860021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 137860021 is about 11741.3807109726. The cubic root of 137860021 is about 516.5901409148.

The spelling of 137860021 in words is "one hundred thirty-seven million, eight hundred sixty thousand, twenty-one".