31213443401 has 12 divisors (see below), whose sum is σ = 37480792320. Its totient is φ = 25891334280.

The previous prime is 31213443397. The next prime is 31213443403. The reversal of 31213443401 is 10434431213.

It is a happy number.

It is not a de Polignac number, because 31213443401 - 2² = 31213443397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213443403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10272821 + ... + 10275858.

It is an arithmetic number, because the mean of its divisors is an integer number (3123399360).

Almost surely, 2^31213443401 is an apocalyptic number.

31213443401 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31213443401 is a deficient number, since it is larger than the sum of its proper divisors (6267348919).

31213443401 is a wasteful number, since it uses less digits than its factorization.

31213443401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20548724 (or 20548717 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 31213443401 its reverse (10434431213), we get a palindrome (41647874614).

The spelling of 31213443401 in words is "thirty-one billion, two hundred thirteen million, four hundred forty-three thousand, four hundred one".