137437021 has 2 divisors, whose sum is σ = 137437022. Its totient is φ = 137437020.

The previous prime is 137437009. The next prime is 137437031. The reversal of 137437021 is 120734731.

137437021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105288121 + 32148900 = 10261^2 + 5670^2 .

It is a cyclic number.

It is not a de Polignac number, because 137437021 - 2²⁵ = 103882589 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137437031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68718510 + 68718511.

It is an arithmetic number, because the mean of its divisors is an integer number (68718511).

Almost surely, 2^137437021 is an apocalyptic number.

It is an amenable number.

137437021 is a deficient number, since it is larger than the sum of its proper divisors (1).

137437021 is an equidigital number, since it uses as much as digits as its factorization.

137437021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 137437021 is about 11723.3536584034. The cubic root of 137437021 is about 516.0612433067.

The spelling of 137437021 in words is "one hundred thirty-seven million, four hundred thirty-seven thousand, twenty-one".