31668421 has 8 divisors (see below), whose sum is σ = 33834080. Its totient is φ = 29552688.

The previous prime is 31668407. The next prime is 31668443. The reversal of 31668421 is 12486613.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31668421 - 2⁵ = 31668389 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 (31668451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11166 + ... + 13711.

It is an arithmetic number, because the mean of its divisors is an integer number (4229260).

Almost surely, 2^31668421 is an apocalyptic number.

It is an amenable number.

31668421 is a deficient number, since it is larger than the sum of its proper divisors (2165659).

31668421 is a wasteful number, since it uses less digits than its factorization.

31668421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24963.

The product of its digits is 6912, while the sum is 31.

The square root of 31668421 is about 5627.4702131597. The cubic root of 31668421 is about 316.3798408663.

The spelling of 31668421 in words is "thirty-one million, six hundred sixty-eight thousand, four hundred twenty-one".