22001121212220 has 144 divisors (see below), whose sum is σ = 66778460304192. Its totient is φ = 5863298918400.

The previous prime is 22001121212207. The next prime is 22001121212249. The reversal of 22001121212220 is 2221212110022.

It is a happy number.

22001121212220 is a `hidden beast` number, since 2 + 200 + 11 + 21 + 212 + 220 = 666.

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 = 22001121212193 and 22001121212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3219829924 + ... + 3219836756.

It is an arithmetic number, because the mean of its divisors is an integer number (463739307668).

Almost surely, 2^{22001121212220} is an apocalyptic number.

22001121212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001121212220 is an abundant number, since it is smaller than the sum of its proper divisors (44777339091972).

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

22001121212220 is a wasteful number, since it uses less digits than its factorization.

22001121212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15412 (or 15407 counting only the distinct ones).

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

Adding to 22001121212220 its reverse (2221212110022), we get a palindrome (24222333322242).

The spelling of 22001121212220 in words is "twenty-two trillion, one billion, one hundred twenty-one million, two hundred twelve thousand, two hundred twenty".