31201101102221 has 4 divisors (see below), whose sum is σ = 31201112770752. Its totient is φ = 31201089433692.

The previous prime is 31201101102217. The next prime is 31201101102247. The reversal of 31201101102221 is 12220110110213.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31201101102221 - 2² = 31201101102217 is a prime.

It is a super-2 number, since 2×31201101102221² (a number of 28 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 31201101102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201101102421) 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 3 ways as a sum of consecutive naturals, for example, 390380 + ... + 7909146.

It is an arithmetic number, because the mean of its divisors is an integer number (7800278192688).

Almost surely, 2^{31201101102221} is an apocalyptic number.

It is an amenable number.

31201101102221 is a deficient number, since it is larger than the sum of its proper divisors (11668531).

31201101102221 is an equidigital number, since it uses as much as digits as its factorization.

31201101102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11668530.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 31201101102221 its reverse (12220110110213), we get a palindrome (43421211212434).

The spelling of 31201101102221 in words is "thirty-one trillion, two hundred one billion, one hundred one million, one hundred two thousand, two hundred twenty-one".