31212220142 has 16 divisors (see below), whose sum is σ = 48865157712. Its totient is φ = 14938198080.

The previous prime is 31212220103. The next prime is 31212220147. The reversal of 31212220142 is 24102221213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212220147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3586568 + ... + 3595259.

It is an arithmetic number, because the mean of its divisors is an integer number (3054072357).

Almost surely, 2^31212220142 is an apocalyptic number.

31212220142 is a deficient number, since it is larger than the sum of its proper divisors (17652937570).

31212220142 is a wasteful number, since it uses less digits than its factorization.

31212220142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7181923.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 31212220142 its reverse (24102221213), we get a palindrome (55314441355).

The spelling of 31212220142 in words is "thirty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred forty-two".