137430263221 has 2 divisors, whose sum is σ = 137430263222. Its totient is φ = 137430263220.

The previous prime is 137430263203. The next prime is 137430263263. The reversal of 137430263221 is 122362034731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135696456900 + 1733806321 = 368370^2 + 41639^2 .

It is a cyclic number.

It is not a de Polignac number, because 137430263221 - 2⁷ = 137430263093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137430263291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68715131610 + 68715131611.

It is an arithmetic number, because the mean of its divisors is an integer number (68715131611).

Almost surely, 2^137430263221 is an apocalyptic number.

It is an amenable number.

137430263221 is a deficient number, since it is larger than the sum of its proper divisors (1).

137430263221 is an equidigital number, since it uses as much as digits as its factorization.

137430263221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 137430263221 its reverse (122362034731), we get a palindrome (259792297952).

The spelling of 137430263221 in words is "one hundred thirty-seven billion, four hundred thirty million, two hundred sixty-three thousand, two hundred twenty-one".