31020011123221 has 4 divisors (see below), whose sum is σ = 31043744874432. Its totient is φ = 30996277372012.

The previous prime is 31020011123219. The next prime is 31020011123249. The reversal of 31020011123221 is 12232111002013.

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 not a de Polignac number, because 31020011123221 - 2¹ = 31020011123219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020011123281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11866873645 + ... + 11866876258.

It is an arithmetic number, because the mean of its divisors is an integer number (7760936218608).

Almost surely, 2^{31020011123221} is an apocalyptic number.

It is an amenable number.

31020011123221 is a deficient number, since it is larger than the sum of its proper divisors (23733751211).

31020011123221 is a wasteful number, since it uses less digits than its factorization.

31020011123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23733751210.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31020011123221 its reverse (12232111002013), we get a palindrome (43252122125234).

The spelling of 31020011123221 in words is "thirty-one trillion, twenty billion, eleven million, one hundred twenty-three thousand, two hundred twenty-one".