31231320022102 has 4 divisors (see below), whose sum is σ = 46846980033156. Its totient is φ = 15615660011050.

The previous prime is 31231320022093. The next prime is 31231320022103. The reversal of 31231320022102 is 20122002313213.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231320022103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7807830005524 + ... + 7807830005527.

It is an arithmetic number, because the mean of its divisors is an integer number (11711745008289).

Almost surely, 2^{31231320022102} is an apocalyptic number.

31231320022102 is a deficient number, since it is larger than the sum of its proper divisors (15615660011054).

31231320022102 is a wasteful number, since it uses less digits than its factorization.

31231320022102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15615660011053.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31231320022102 its reverse (20122002313213), we get a palindrome (51353322335315).

The spelling of 31231320022102 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty million, twenty-two thousand, one hundred two".