21000222222102 has 80 divisors (see below), whose sum is σ = 47387964686832. Its totient is φ = 6950777287680.

The previous prime is 21000222222059. The next prime is 21000222222131. The reversal of 21000222222102 is 20122222200012.

21000222222102 is a `hidden beast` number, since 210 + 0 + 0 + 22 + 222 + 210 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 28604902 + ... + 29329862.

Almost surely, 2^{21000222222102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000222222102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23693982343416).

21000222222102 is an abundant number, since it is smaller than the sum of its proper divisors (26387742464730).

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

21000222222102 is a wasteful number, since it uses less digits than its factorization.

21000222222102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726235 (or 726226 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21000222222102 its reverse (20122222200012), we get a palindrome (41122444422114).

The spelling of 21000222222102 in words is "twenty-one trillion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred two".