21222121020000 has 240 divisors, whose sum is σ = 73707675581232. Its totient is φ = 5326336000000.

The previous prime is 21222121019987. The next prime is 21222121020013. The reversal of 21222121020000 is 2012122212.

It is an interprime number because it is at equal distance from previous prime (21222121019987) and next prime (21222121020013).

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9383001 + ... + 11423000.

Almost surely, 2^{21222121020000} is an apocalyptic number.

21222121020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222121020000 is an abundant number, since it is smaller than the sum of its proper divisors (52485554561232).

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

21222121020000 is a wasteful number, since it uses less digits than its factorization.

21222121020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20806051 (or 20806028 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222121020000 its reverse (2012122212), we get a palindrome (21224133142212).

The spelling of 21222121020000 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-one million, twenty thousand".