31221252252442 has 32 divisors (see below), whose sum is σ = 53596952703360. Its totient is φ = 13361836800960.

The previous prime is 31221252252419. The next prime is 31221252252479. The reversal of 31221252252442 is 24425225212213.

It is a super-2 number, since 2×31221252252442² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 296060148 + ... + 296165584.

It is an arithmetic number, because the mean of its divisors is an integer number (1674904771980).

Almost surely, 2^{31221252252442} is an apocalyptic number.

31221252252442 is a deficient number, since it is larger than the sum of its proper divisors (22375700450918).

31221252252442 is a wasteful number, since it uses less digits than its factorization.

31221252252442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134806.

The product of its digits is 153600, while the sum is 37.

Adding to 31221252252442 its reverse (24425225212213), we get a palindrome (55646477464655).

The spelling of 31221252252442 in words is "thirty-one trillion, two hundred twenty-one billion, two hundred fifty-two million, two hundred fifty-two thousand, four hundred forty-two".