31221000342 has 64 divisors (see below), whose sum is σ = 79327987200. Its totient is φ = 8916173280.

The previous prime is 31221000319. The next prime is 31221000347. The reversal of 31221000342 is 24300012213.

31221000342 is a `hidden beast` number, since 312 + 2 + 10 + 0 + 0 + 342 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221000347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 854917 + ... + 890687.

It is an arithmetic number, because the mean of its divisors is an integer number (1239499800).

Almost surely, 2^31221000342 is an apocalyptic number.

31221000342 is an abundant number, since it is smaller than the sum of its proper divisors (48106986858).

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

31221000342 is a wasteful number, since it uses less digits than its factorization.

31221000342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38098 (or 38092 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31221000342 its reverse (24300012213), we get a palindrome (55521012555).

The spelling of 31221000342 in words is "thirty-one billion, two hundred twenty-one million, three hundred forty-two", and thus it is an aban number.