421557107 has 2 divisors, whose sum is σ = 421557108. Its totient is φ = 421557106.

The previous prime is 421557077. The next prime is 421557113. The reversal of 421557107 is 701755124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421557107 - 2²⁴ = 404779891 is a prime.

It is equal to p_22422965 and since 421557107 and 22422965 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421557167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210778553 + 210778554.

It is an arithmetic number, because the mean of its divisors is an integer number (210778554).

Almost surely, 2^421557107 is an apocalyptic number.

421557107 is a deficient number, since it is larger than the sum of its proper divisors (1).

421557107 is an equidigital number, since it uses as much as digits as its factorization.

421557107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9800, while the sum is 32.

The square root of 421557107 is about 20531.8559073455. The cubic root of 421557107 is about 749.8115716266.

The spelling of 421557107 in words is "four hundred twenty-one million, five hundred fifty-seven thousand, one hundred seven".