21222020202123 has 32 divisors (see below), whose sum is σ = 30753521075200. Its totient is φ = 12939339240576.

The previous prime is 21222020202109. The next prime is 21222020202137. The reversal of 21222020202123 is 32120202022212.

It is an interprime number because it is at equal distance from previous prime (21222020202109) and next prime (21222020202137).

It is not a de Polignac number, because 21222020202123 - 2⁸ = 21222020201867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222020202123.

It is not an unprimeable number, because it can be changed into a prime (21222020202323) 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, 113999586 + ... + 114185592.

It is an arithmetic number, because the mean of its divisors is an integer number (961047533600).

Almost surely, 2^{21222020202123} is an apocalyptic number.

21222020202123 is a deficient number, since it is larger than the sum of its proper divisors (9531500873077).

21222020202123 is a wasteful number, since it uses less digits than its factorization.

21222020202123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212971.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21222020202123 its reverse (32120202022212), we get a palindrome (53342222224335).

The spelling of 21222020202123 in words is "twenty-one trillion, two hundred twenty-two billion, twenty million, two hundred two thousand, one hundred twenty-three".