22121102012220 has 36 divisors (see below), whose sum is σ = 67100676104280. Its totient is φ = 5898960536544.

The previous prime is 22121102012033. The next prime is 22121102012231. The reversal of 22121102012220 is 2221020112122.

It is a happy number.

22121102012220 is a `hidden beast` number, since 221 + 21 + 1 + 0 + 201 + 2 + 220 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 22121102012193 and 22121102012202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61447505410 + ... + 61447505769.

Almost surely, 2^{22121102012220} is an apocalyptic number.

22121102012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121102012220 is an abundant number, since it is smaller than the sum of its proper divisors (44979574092060).

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

22121102012220 is a wasteful number, since it uses less digits than its factorization.

22121102012220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122895011194 (or 122895011189 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 22121102012220 its reverse (2221020112122), we get a palindrome (24342122124342).

The spelling of 22121102012220 in words is "twenty-two trillion, one hundred twenty-one billion, one hundred two million, twelve thousand, two hundred twenty".