22121000012220 has 48 divisors (see below), whose sum is σ = 62384402935680. Its totient is φ = 5856494965056.

The previous prime is 22121000012219. The next prime is 22121000012227. The reversal of 22121000012220 is 2221000012122.

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

It is a self number, because there is not a number n which added to its sum of digits gives 22121000012220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121000012227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1326190702 + ... + 1326207381.

It is an arithmetic number, because the mean of its divisors is an integer number (1299675061160).

Almost surely, 2^{22121000012220} is an apocalyptic number.

22121000012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121000012220 is an abundant number, since it is smaller than the sum of its proper divisors (40263402923460).

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

22121000012220 is a wasteful number, since it uses less digits than its factorization.

22121000012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652398234 (or 2652398232 counting only the distinct ones).

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

Adding to 22121000012220 its reverse (2221000012122), we get a palindrome (24342000024342).

The spelling of 22121000012220 in words is "twenty-two trillion, one hundred twenty-one billion, twelve thousand, two hundred twenty".