22121202144 has 48 divisors (see below), whose sum is σ = 58321786320. Its totient is φ = 7341527040.

The previous prime is 22121202139. The next prime is 22121202151. The reversal of 22121202144 is 44120212122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 22121202144.

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, 481137 + ... + 525104.

It is an arithmetic number, because the mean of its divisors is an integer number (1215037215).

Almost surely, 2^22121202144 is an apocalyptic number.

22121202144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22121202144 is an abundant number, since it is smaller than the sum of its proper divisors (36200584176).

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

22121202144 is a wasteful number, since it uses less digits than its factorization.

22121202144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006483 (or 1006475 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 22121202144 its reverse (44120212122), we get a palindrome (66241414266).

The spelling of 22121202144 in words is "twenty-two billion, one hundred twenty-one million, two hundred two thousand, one hundred forty-four".