31023020011221 has 24 divisors (see below), whose sum is σ = 51278856295680. Its totient is φ = 17704506679776.

The previous prime is 31023020011219. The next prime is 31023020011231. The reversal of 31023020011221 is 12211002032013.

31023020011221 is a `hidden beast` number, since 3 + 1 + 0 + 230 + 200 + 11 + 221 = 666.

It is not a de Polignac number, because 31023020011221 - 2¹ = 31023020011219 is a prime.

It is a super-2 number, since 2×31023020011221² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31023020011194 and 31023020011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023020011231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 318469341 + ... + 318566738.

It is an arithmetic number, because the mean of its divisors is an integer number (2136619012320).

Almost surely, 2^{31023020011221} is an apocalyptic number.

It is an amenable number.

31023020011221 is a deficient number, since it is larger than the sum of its proper divisors (20255836284459).

31023020011221 is a wasteful number, since it uses less digits than its factorization.

31023020011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637036865 (or 637036862 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31023020011221 its reverse (12211002032013), we get a palindrome (43234022043234).

The spelling of 31023020011221 in words is "thirty-one trillion, twenty-three billion, twenty million, eleven thousand, two hundred twenty-one".