31212310221213 has 32 divisors (see below), whose sum is σ = 45862482880512. Its totient is φ = 18724181280000.

The previous prime is 31212310221149. The next prime is 31212310221217. The reversal of 31212310221213 is 31212201321213.

It is not a de Polignac number, because 31212310221213 - 2⁶ = 31212310221149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212310221217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2772195 + ... + 8373152.

It is an arithmetic number, because the mean of its divisors is an integer number (1433202590016).

Almost surely, 2^{31212310221213} is an apocalyptic number.

31212310221213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31212310221213 is a deficient number, since it is larger than the sum of its proper divisors (14650172659299).

31212310221213 is a wasteful number, since it uses less digits than its factorization.

31212310221213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11146225.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31212310221213 its reverse (31212201321213), we get a palindrome (62424511542426).

The spelling of 31212310221213 in words is "thirty-one trillion, two hundred twelve billion, three hundred ten million, two hundred twenty-one thousand, two hundred thirteen".