22012121020 has 96 divisors (see below), whose sum is σ = 49945190400. Its totient is φ = 8125159680.

The previous prime is 22012121017. The next prime is 22012121029. The reversal of 22012121020 is 2012121022.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012121029) 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, 4974529 + ... + 4978951.

It is an arithmetic number, because the mean of its divisors is an integer number (520262400).

Almost surely, 2^22012121020 is an apocalyptic number.

22012121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22012121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24972595200).

22012121020 is an abundant number, since it is smaller than the sum of its proper divisors (27933069380).

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

22012121020 is a wasteful number, since it uses less digits than its factorization.

22012121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4835 (or 4833 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22012121020 its reverse (2012121022), we get a palindrome (24024242042).

The spelling of 22012121020 in words is "twenty-two billion, twelve million, one hundred twenty-one thousand, twenty".