22121220121220 has 48 divisors (see below), whose sum is σ = 50678413382016. Its totient is φ = 8043967488000.

The previous prime is 22121220121193. The next prime is 22121220121223. The reversal of 22121220121220 is 2212102212122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22121220121192 and 22121220121201.

It is not an unprimeable number, because it can be changed into a prime (22121220121223) 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, 15948905 + ... + 17280335.

It is an arithmetic number, because the mean of its divisors is an integer number (1055800278792).

Almost surely, 2^{22121220121220} is an apocalyptic number.

22121220121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121220121220 is an abundant number, since it is smaller than the sum of its proper divisors (28557193260796).

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

22121220121220 is a wasteful number, since it uses less digits than its factorization.

22121220121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406972 (or 1406970 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 22121220121220 its reverse (2212102212122), we get a palindrome (24333322333342).

The spelling of 22121220121220 in words is "twenty-two trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".