31220121313021 has 8 divisors (see below), whose sum is σ = 32765827248000. Its totient is φ = 29690107824432.

The previous prime is 31220121313013. The next prime is 31220121313033. The reversal of 31220121313021 is 12031312102213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31220121313021 - 2³ = 31220121313013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31220121312983 and 31220121313001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31220121313061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3923107521 + ... + 3923115478.

It is an arithmetic number, because the mean of its divisors is an integer number (4095728406000).

Almost surely, 2^{31220121313021} is an apocalyptic number.

It is an amenable number.

31220121313021 is a deficient number, since it is larger than the sum of its proper divisors (1545705934979).

31220121313021 is a wasteful number, since it uses less digits than its factorization.

31220121313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7846223195.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31220121313021 its reverse (12031312102213), we get a palindrome (43251433415234).

The spelling of 31220121313021 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-one million, three hundred thirteen thousand, twenty-one".