22121100012 has 24 divisors (see below), whose sum is σ = 56308254912. Its totient is φ = 6703363600.

The previous prime is 22121099989. The next prime is 22121100013. The reversal of 22121100012 is 21000112122.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (22121100013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83791914 + ... + 83792177.

It is an arithmetic number, because the mean of its divisors is an integer number (2346177288).

Almost surely, 2^22121100012 is an apocalyptic number.

22121100012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22121100012 is an abundant number, since it is smaller than the sum of its proper divisors (34187154900).

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

22121100012 is a wasteful number, since it uses less digits than its factorization.

22121100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167584109 (or 167584107 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22121100012 its reverse (21000112122), we get a palindrome (43121212134).

The spelling of 22121100012 in words is "twenty-two billion, one hundred twenty-one million, one hundred thousand, twelve".