21121221000222 has 48 divisors (see below), whose sum is σ = 55052806623360. Its totient is φ = 5717022224976.

The previous prime is 21121221000221. The next prime is 21121221000239. The reversal of 21121221000222 is 22200012212112.

It is a happy number.

21121221000222 is a `hidden beast` number, since 21 + 1 + 212 + 210 + 0 + 0 + 222 = 666.

It is a super-2 number, since 2×21121221000222² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21121221000195 and 21121221000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121221000221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4411280188 + ... + 4411284975.

It is an arithmetic number, because the mean of its divisors is an integer number (1146933471320).

Almost surely, 2^{21121221000222} is an apocalyptic number.

21121221000222 is an abundant number, since it is smaller than the sum of its proper divisors (33931585623138).

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

21121221000222 is a wasteful number, since it uses less digits than its factorization.

21121221000222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8822565197 (or 8822565194 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21121221000222 its reverse (22200012212112), we get a palindrome (43321233212334).

The spelling of 21121221000222 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two", and thus it is an aban number.