21122221222220 has 48 divisors (see below), whose sum is σ = 44429191439808. Its totient is φ = 8435075201280.

The previous prime is 21122221222187. The next prime is 21122221222229. The reversal of 21122221222220 is 2222212222112.

It is a super-2 number, since 2×21122221222220² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122221222229) 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, 409026242 + ... + 409077878.

It is an arithmetic number, because the mean of its divisors is an integer number (925608154996).

Almost surely, 2^{21122221222220} is an apocalyptic number.

21122221222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122221222220 is an abundant number, since it is smaller than the sum of its proper divisors (23306970217588).

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

21122221222220 is a wasteful number, since it uses less digits than its factorization.

21122221222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84690 (or 84688 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21122221222220 its reverse (2222212222112), we get a palindrome (23344433444332).

The spelling of 21122221222220 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty".