21122221222000 has 40 divisors (see below), whose sum is σ = 51073530919632. Its totient is φ = 8448888488000.

The previous prime is 21122221221973. The next prime is 21122221222001. The reversal of 21122221222000 is 22212222112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21122221222000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122221222001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5280553306 + ... + 5280557305.

Almost surely, 2^{21122221222000} is an apocalyptic number.

21122221222000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122221222000 is an abundant number, since it is smaller than the sum of its proper divisors (29951309697632).

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

21122221222000 is a wasteful number, since it uses less digits than its factorization.

21122221222000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10561110634 (or 10561110618 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21122221222000 its reverse (22212222112), we get a palindrome (21144433444112).

The spelling of 21122221222000 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand".