31221442233142 has 32 divisors (see below), whose sum is σ = 54835859796480. Its totient is φ = 13056157013760.

The previous prime is 31221442233101. The next prime is 31221442233181. The reversal of 31221442233142 is 24133224412213.

It is a junction number, because it is equal to n+sod(n) for n = 31221442233098 and 31221442233107.

It is a congruent number.

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, 161810292 + ... + 162003127.

It is an arithmetic number, because the mean of its divisors is an integer number (1713620618640).

Almost surely, 2^{31221442233142} is an apocalyptic number.

31221442233142 is a deficient number, since it is larger than the sum of its proper divisors (23614417563338).

31221442233142 is a wasteful number, since it uses less digits than its factorization.

31221442233142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323813596.

The product of its digits is 55296, while the sum is 34.

Adding to 31221442233142 its reverse (24133224412213), we get a palindrome (55354666645355).

The spelling of 31221442233142 in words is "thirty-one trillion, two hundred twenty-one billion, four hundred forty-two million, two hundred thirty-three thousand, one hundred forty-two".