31213031202106 has 16 divisors (see below), whose sum is σ = 50987579063400. Its totient is φ = 14244149069568.

The previous prime is 31213031202061. The next prime is 31213031202149. The reversal of 31213031202106 is 60120213031213.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25769745584881 + 5443285617225 = 5076391^2 + 2333085^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6744386451 + ... + 6744391078.

Almost surely, 2^{31213031202106} is an apocalyptic number.

31213031202106 is a deficient number, since it is larger than the sum of its proper divisors (19774547861294).

31213031202106 is a wasteful number, since it uses less digits than its factorization.

31213031202106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488777633.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31213031202106 its reverse (60120213031213), we get a palindrome (91333244233319).

The spelling of 31213031202106 in words is "thirty-one trillion, two hundred thirteen billion, thirty-one million, two hundred two thousand, one hundred six".