12222121020 has 24 divisors (see below), whose sum is σ = 34221939024. Its totient is φ = 3259232256.

The previous prime is 12222121001. The next prime is 12222121031. The reversal of 12222121020 is 2012122221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101850949 + ... + 101851068.

It is an arithmetic number, because the mean of its divisors is an integer number (1425914126).

Almost surely, 2^12222121020 is an apocalyptic number.

12222121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12222121020 is an abundant number, since it is smaller than the sum of its proper divisors (21999818004).

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

12222121020 is a wasteful number, since it uses less digits than its factorization.

12222121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203702029 (or 203702027 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 12222121020 its reverse (2012122221), we get a palindrome (14234243241).

The spelling of 12222121020 in words is "twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty".