667031421 has 16 divisors (see below), whose sum is σ = 1020392064. Its totient is φ = 379674624.

The previous prime is 667031411. The next prime is 667031459. The reversal of 667031421 is 124130766.

It is not a de Polignac number, because 667031421 - 2⁷ = 667031293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667031411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56400 + ... + 67193.

It is an arithmetic number, because the mean of its divisors is an integer number (63774504).

Almost surely, 2^667031421 is an apocalyptic number.

It is an amenable number.

667031421 is a deficient number, since it is larger than the sum of its proper divisors (353360643).

667031421 is a wasteful number, since it uses less digits than its factorization.

667031421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123860.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 667031421 is about 25826.9514461154. The cubic root of 667031421 is about 873.7397568186.

The spelling of 667031421 in words is "six hundred sixty-seven million, thirty-one thousand, four hundred twenty-one".