22001000021220 has 48 divisors (see below), whose sum is σ = 67203054612288. Its totient is φ = 5333575762560.

The previous prime is 22001000021207. The next prime is 22001000021227. The reversal of 22001000021220 is 2212000010022.

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

It is a junction number, because it is equal to n+sod(n) for n = 22001000021196 and 22001000021205.

It is not an unprimeable number, because it can be changed into a prime (22001000021227) 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, 16667423599 + ... + 16667424918.

It is an arithmetic number, because the mean of its divisors is an integer number (1400063637756).

Almost surely, 2^{22001000021220} is an apocalyptic number.

22001000021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22001000021220 is an abundant number, since it is smaller than the sum of its proper divisors (45202054591068).

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

22001000021220 is a wasteful number, since it uses less digits than its factorization.

22001000021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33334848540 (or 33334848538 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22001000021220 its reverse (2212000010022), we get a palindrome (24213000031242).

The spelling of 22001000021220 in words is "twenty-two trillion, one billion, twenty-one thousand, two hundred twenty".