421512137 has 2 divisors, whose sum is σ = 421512138. Its totient is φ = 421512136.

The previous prime is 421512067. The next prime is 421512139. The reversal of 421512137 is 731215124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382437136 + 39075001 = 19556^2 + 6251^2 .

It is a cyclic number.

It is not a de Polignac number, because 421512137 - 2¹⁶ = 421446601 is a prime.

Together with 421512139, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421512139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210756068 + 210756069.

It is an arithmetic number, because the mean of its divisors is an integer number (210756069).

Almost surely, 2^421512137 is an apocalyptic number.

It is an amenable number.

421512137 is a deficient number, since it is larger than the sum of its proper divisors (1).

421512137 is an equidigital number, since it uses as much as digits as its factorization.

421512137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 421512137 is about 20530.7607506395. The cubic root of 421512137 is about 749.7849083941.

The spelling of 421512137 in words is "four hundred twenty-one million, five hundred twelve thousand, one hundred thirty-seven".