22131221520012 has 48 divisors (see below), whose sum is σ = 57708018877824. Its totient is φ = 6542859280000.

The previous prime is 22131221520011. The next prime is 22131221520013. The reversal of 22131221520012 is 21002512213122.

It is an interprime number because it is at equal distance from previous prime (22131221520011) and next prime (22131221520013).

It is not an unprimeable number, because it can be changed into a prime (22131221520011) 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, 2044638114 + ... + 2044648937.

It is an arithmetic number, because the mean of its divisors is an integer number (1202250393288).

Almost surely, 2^{22131221520012} is an apocalyptic number.

22131221520012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

22131221520012 is an abundant number, since it is smaller than the sum of its proper divisors (35576797357812).

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

22131221520012 is a wasteful number, since it uses less digits than its factorization.

22131221520012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4089287110 (or 4089287108 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 22131221520012 its reverse (21002512213122), we get a palindrome (43133733733134).

The spelling of 22131221520012 in words is "twenty-two trillion, one hundred thirty-one billion, two hundred twenty-one million, five hundred twenty thousand, twelve".