31312021201 has 4 divisors (see below), whose sum is σ = 32391746100. Its totient is φ = 30232296304.

The previous prime is 31312021151. The next prime is 31312021219. The reversal of 31312021201 is 10212021313.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20800850625 + 10511170576 = 144225^2 + 102524^2 .

It is not a de Polignac number, because 31312021201 - 2²¹ = 31309924049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31312021501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539862406 + ... + 539862463.

It is an arithmetic number, because the mean of its divisors is an integer number (8097936525).

Almost surely, 2^31312021201 is an apocalyptic number.

It is an amenable number.

31312021201 is a deficient number, since it is larger than the sum of its proper divisors (1079724899).

31312021201 is a wasteful number, since it uses less digits than its factorization.

31312021201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079724898.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31312021201 its reverse (10212021313), we get a palindrome (41524042514).

The spelling of 31312021201 in words is "thirty-one billion, three hundred twelve million, twenty-one thousand, two hundred one".