137880944021 has 2 divisors, whose sum is σ = 137880944022. Its totient is φ = 137880944020.

The previous prime is 137880943919. The next prime is 137880944023. The reversal of 137880944021 is 120449088731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78800349796 + 59080594225 = 280714^2 + 243065^2 .

It is a cyclic number.

It is not a de Polignac number, because 137880944021 - 2²⁶ = 137813835157 is a prime.

It is a super-2 number, since 2×137880944021² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

Together with 137880944023, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137880944023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68940472010 + 68940472011.

It is an arithmetic number, because the mean of its divisors is an integer number (68940472011).

Almost surely, 2^137880944021 is an apocalyptic number.

It is an amenable number.

137880944021 is a deficient number, since it is larger than the sum of its proper divisors (1).

137880944021 is an equidigital number, since it uses as much as digits as its factorization.

137880944021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 137880944021 in words is "one hundred thirty-seven billion, eight hundred eighty million, nine hundred forty-four thousand, twenty-one".