21021102012222 has 128 divisors (see below), whose sum is σ = 50402336624640. Its totient is φ = 6455772576000.

The previous prime is 21021102012181. The next prime is 21021102012293. The reversal of 21021102012222 is 22221020112012.

It is a happy number.

21021102012222 is a `hidden beast` number, since 210 + 21 + 10 + 201 + 2 + 222 = 666.

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 = 21021102012195 and 21021102012204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 999518847 + ... + 999539877.

It is an arithmetic number, because the mean of its divisors is an integer number (393768254880).

Almost surely, 2^{21021102012222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21021102012222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25201168312320).

21021102012222 is an abundant number, since it is smaller than the sum of its proper divisors (29381234612418).

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

21021102012222 is a wasteful number, since it uses less digits than its factorization.

21021102012222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23687 (or 23681 counting only the distinct ones).

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

Adding to 21021102012222 its reverse (22221020112012), we get a palindrome (43242122124234).

The spelling of 21021102012222 in words is "twenty-one trillion, twenty-one billion, one hundred two million, twelve thousand, two hundred twenty-two".