31221002 has 8 divisors (see below), whose sum is σ = 47314596. Its totient is φ = 15449472.

The previous prime is 31220989. The next prime is 31221017. The reversal of 31221002 is 20012213.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31147561 + 73441 = 5581^2 + 271^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80273 + ... + 80660.

Almost surely, 2^31221002 is an apocalyptic number.

31221002 is a deficient number, since it is larger than the sum of its proper divisors (16093594).

31221002 is a wasteful number, since it uses less digits than its factorization.

31221002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161032.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31221002 is about 5587.5756818141. The cubic root of 31221002 is about 314.8828051478.

Adding to 31221002 its reverse (20012213), we get a palindrome (51233215).

The spelling of 31221002 in words is "thirty-one million, two hundred twenty-one thousand, two".