31721422 has 8 divisors (see below), whose sum is σ = 50381136. Its totient is φ = 14927712.

The previous prime is 31721419. The next prime is 31721429. The reversal of 31721422 is 22412713.

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

It is a super-2 number, since 2×31721422² = 2012497227404168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31721393 and 31721402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31721429) 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 3 ways as a sum of consecutive naturals, for example, 466458 + ... + 466525.

It is an arithmetic number, because the mean of its divisors is an integer number (6297642).

Almost surely, 2^31721422 is an apocalyptic number.

31721422 is a deficient number, since it is larger than the sum of its proper divisors (18659714).

31721422 is a wasteful number, since it uses less digits than its factorization.

31721422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933002.

The product of its digits is 672, while the sum is 22.

The square root of 31721422 is about 5632.1773764682. The cubic root of 31721422 is about 316.5562426930.

The spelling of 31721422 in words is "thirty-one million, seven hundred twenty-one thousand, four hundred twenty-two".