31212403353 has 20 divisors (see below), whose sum is σ = 47886100900. Its totient is φ = 20245881312.

The previous prime is 31212403319. The next prime is 31212403357. The reversal of 31212403353 is 35330421213.

31212403353 is a `hidden beast` number, since 312 + 12 + 4 + 0 + 335 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29959455744 + 1252947609 = 173088^2 + 35397^2 .

It is not a de Polignac number, because 31212403353 - 2⁸ = 31212403097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212403357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5204278 + ... + 5210271.

It is an arithmetic number, because the mean of its divisors is an integer number (2394305045).

Almost surely, 2^31212403353 is an apocalyptic number.

It is an amenable number.

31212403353 is a deficient number, since it is larger than the sum of its proper divisors (16673697547).

31212403353 is a wasteful number, since it uses less digits than its factorization.

31212403353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10414598 (or 10414589 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 31212403353 its reverse (35330421213), we get a palindrome (66542824566).

The spelling of 31212403353 in words is "thirty-one billion, two hundred twelve million, four hundred three thousand, three hundred fifty-three".