21211201002222 has 96 divisors (see below), whose sum is σ = 58023078497280. Its totient is φ = 5439663552960.

The previous prime is 21211201002197. The next prime is 21211201002227. The reversal of 21211201002222 is 22220010211212.

It is a happy number.

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 = 21211201002195 and 21211201002204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211201002227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 96750613 + ... + 96969600.

It is an arithmetic number, because the mean of its divisors is an integer number (604407067680).

Almost surely, 2^{21211201002222} is an apocalyptic number.

21211201002222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21211201002222 is an abundant number, since it is smaller than the sum of its proper divisors (36811877495058).

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

21211201002222 is a wasteful number, since it uses less digits than its factorization.

21211201002222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193720318 (or 193720315 counting only the distinct ones).

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

Adding to 21211201002222 its reverse (22220010211212), we get a palindrome (43431211213434).

The spelling of 21211201002222 in words is "twenty-one trillion, two hundred eleven billion, two hundred one million, two thousand, two hundred twenty-two".