31212102 has 32 divisors (see below), whose sum is σ = 68235264. Its totient is φ = 9475200.

The previous prime is 31212061. The next prime is 31212113. The reversal of 31212102 is 20121213.

It is a super-2 number, since 2×31212102² = 1948390622516808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1774 + ... + 8097.

It is an arithmetic number, because the mean of its divisors is an integer number (2132352).

Almost surely, 2^31212102 is an apocalyptic number.

31212102 is an abundant number, since it is smaller than the sum of its proper divisors (37023162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31212102 is a wasteful number, since it uses less digits than its factorization.

31212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9924.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31212102 is about 5586.7792152545. The cubic root of 31212102 is about 314.8528816655.

Adding to 31212102 its reverse (20121213), we get a palindrome (51333315).

The spelling of 31212102 in words is "thirty-one million, two hundred twelve thousand, one hundred two".