137403612221 has 2 divisors, whose sum is σ = 137403612222. Its totient is φ = 137403612220.

The previous prime is 137403612173. The next prime is 137403612257. The reversal of 137403612221 is 122216304731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99849048121 + 37554564100 = 315989^2 + 193790^2 .

It is a cyclic number.

It is not a de Polignac number, because 137403612221 - 2²⁶ = 137336503357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137403612821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68701806110 + 68701806111.

It is an arithmetic number, because the mean of its divisors is an integer number (68701806111).

Almost surely, 2^137403612221 is an apocalyptic number.

It is an amenable number.

137403612221 is a deficient number, since it is larger than the sum of its proper divisors (1).

137403612221 is an equidigital number, since it uses as much as digits as its factorization.

137403612221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 32.

Adding to 137403612221 its reverse (122216304731), we get a palindrome (259619916952).

The spelling of 137403612221 in words is "one hundred thirty-seven billion, four hundred three million, six hundred twelve thousand, two hundred twenty-one".