31211321201 has 4 divisors (see below), whose sum is σ = 31214763504. Its totient is φ = 31207878900.

The previous prime is 31211321179. The next prime is 31211321221. The reversal of 31211321201 is 10212311213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31211321201 is a prime.

It is a super-2 number, since 2×31211321201² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31211321201.

It is not an unprimeable number, because it can be changed into a prime (31211321221) 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, 1707515 + ... + 1725696.

It is an arithmetic number, because the mean of its divisors is an integer number (7803690876).

Almost surely, 2^31211321201 is an apocalyptic number.

It is an amenable number.

31211321201 is a deficient number, since it is larger than the sum of its proper divisors (3442303).

31211321201 is an equidigital number, since it uses as much as digits as its factorization.

31211321201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3442302.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31211321201 its reverse (10212311213), we get a palindrome (41423632414).

The spelling of 31211321201 in words is "thirty-one billion, two hundred eleven million, three hundred twenty-one thousand, two hundred one".