12221323020 has 36 divisors (see below), whose sum is σ = 37071347040. Its totient is φ = 3259019424.

The previous prime is 12221322991. The next prime is 12221323141. The reversal of 12221323020 is 2032312221.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12221322984 and 12221323002.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33947940 + ... + 33948299.

It is an arithmetic number, because the mean of its divisors is an integer number (1029759640).

Almost surely, 2^12221323020 is an apocalyptic number.

12221323020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221323020 is an abundant number, since it is smaller than the sum of its proper divisors (24850024020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221323020 is a wasteful number, since it uses less digits than its factorization.

12221323020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67896254 (or 67896249 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 12221323020 its reverse (2032312221), we get a palindrome (14253635241).

It can be divided in two parts, 12221 and 323020, that added together give a square (335241 = 579²).

The spelling of 12221323020 in words is "twelve billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty".