20021322331231 has 32 divisors (see below), whose sum is σ = 22676435308800. Its totient is φ = 17554623989760.

The previous prime is 20021322331189. The next prime is 20021322331247. The reversal of 20021322331231 is 13213322312002.

It is not a de Polignac number, because 20021322331231 - 2⁹ = 20021322330719 is a prime.

It is a super-2 number, since 2×20021322331231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20021322331196 and 20021322331205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021322331261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 421851 + ... + 6341971.

It is an arithmetic number, because the mean of its divisors is an integer number (708638603400).

Almost surely, 2^{20021322331231} is an apocalyptic number.

20021322331231 is a deficient number, since it is larger than the sum of its proper divisors (2655112977569).

20021322331231 is a wasteful number, since it uses less digits than its factorization.

20021322331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5920339.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 20021322331231 its reverse (13213322312002), we get a palindrome (33234644643233).

The spelling of 20021322331231 in words is "twenty trillion, twenty-one billion, three hundred twenty-two million, three hundred thirty-one thousand, two hundred thirty-one".