31642421 has 8 divisors (see below), whose sum is σ = 32396544. Its totient is φ = 30891760.

The previous prime is 31642399. The next prime is 31642477. The reversal of 31642421 is 12424613.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31642421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31642021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30176 + ... + 31206.

It is an arithmetic number, because the mean of its divisors is an integer number (4049568).

Almost surely, 2^31642421 is an apocalyptic number.

It is an amenable number.

31642421 is a deficient number, since it is larger than the sum of its proper divisors (754123).

31642421 is a wasteful number, since it uses less digits than its factorization.

31642421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731.

The product of its digits is 1152, while the sum is 23.

The square root of 31642421 is about 5625.1596421791. The cubic root of 31642421 is about 316.2932337900.

The spelling of 31642421 in words is "thirty-one million, six hundred forty-two thousand, four hundred twenty-one".