3207157421 has 32 divisors (see below), whose sum is σ = 3916308480. Its totient is φ = 2596017600.

The previous prime is 3207157397. The next prime is 3207157427. The reversal of 3207157421 is 1247517023.

It is a cyclic number.

It is not a de Polignac number, because 3207157421 - 2¹⁴ = 3207141037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3207157427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 167006 + ... + 185216.

It is an arithmetic number, because the mean of its divisors is an integer number (122384640).

Almost surely, 2^3207157421 is an apocalyptic number.

3207157421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3207157421 is a deficient number, since it is larger than the sum of its proper divisors (709151059).

3207157421 is a wasteful number, since it uses less digits than its factorization.

3207157421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18297.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 3207157421 is about 56631.7704208512. The cubic root of 3207157421 is about 1474.7104548575.

The spelling of 3207157421 in words is "three billion, two hundred seven million, one hundred fifty-seven thousand, four hundred twenty-one".