20321223031021 has 16 divisors (see below), whose sum is σ = 22199973048000. Its totient is φ = 18447714875520.

The previous prime is 20321223030973. The next prime is 20321223031049. The reversal of 20321223031021 is 12013032212302.

It is a cyclic number.

It is not a de Polignac number, because 20321223031021 - 2⁹ = 20321223030509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20321223030983 and 20321223031001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321223031051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28465186 + ... + 29170348.

It is an arithmetic number, because the mean of its divisors is an integer number (1387498315500).

Almost surely, 2^{20321223031021} is an apocalyptic number.

It is an amenable number.

20321223031021 is a deficient number, since it is larger than the sum of its proper divisors (1878750016979).

20321223031021 is a wasteful number, since it uses less digits than its factorization.

20321223031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708876.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 20321223031021 its reverse (12013032212302), we get a palindrome (32334255243323).

The spelling of 20321223031021 in words is "twenty trillion, three hundred twenty-one billion, two hundred twenty-three million, thirty-one thousand, twenty-one".