21222021122000 has 160 divisors (see below), whose sum is σ = 52026804071424. Its totient is φ = 8371744320000.

The previous prime is 21222021121883. The next prime is 21222021122041. The reversal of 21222021122000 is 22112022212.

It is a happy number.

It is a super-2 number, since 2×21222021122000² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21222021122000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47499650 + ... + 47944350.

Almost surely, 2^{21222021122000} is an apocalyptic number.

21222021122000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222021122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26013402035712).

21222021122000 is an abundant number, since it is smaller than the sum of its proper divisors (30804782949424).

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

21222021122000 is a wasteful number, since it uses less digits than its factorization.

21222021122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445054 (or 445038 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222021122000 its reverse (22112022212), we get a palindrome (21244133144212).

The spelling of 21222021122000 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, one hundred twenty-two thousand".