421387513 has 2 divisors, whose sum is σ = 421387514. Its totient is φ = 421387512.

The previous prime is 421387511. The next prime is 421387541. The reversal of 421387513 is 315783124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313892089 + 107495424 = 17717^2 + 10368^2 .

It is a cyclic number.

It is not a de Polignac number, because 421387513 - 2¹ = 421387511 is a prime.

It is a super-2 number, since 2×421387513² = 355134872224650338, which contains 22 as substring.

Together with 421387511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421387511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210693756 + 210693757.

It is an arithmetic number, because the mean of its divisors is an integer number (210693757).

Almost surely, 2^421387513 is an apocalyptic number.

It is an amenable number.

421387513 is a deficient number, since it is larger than the sum of its proper divisors (1).

421387513 is an equidigital number, since it uses as much as digits as its factorization.

421387513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 34.

The square root of 421387513 is about 20527.7254706896. The cubic root of 421387513 is about 749.7110074735.

The spelling of 421387513 in words is "four hundred twenty-one million, three hundred eighty-seven thousand, five hundred thirteen".