21222012102 has 16 divisors (see below), whose sum is σ = 42447812400. Its totient is φ = 7073372672.

The previous prime is 21222012061. The next prime is 21222012107. The reversal of 21222012102 is 20121022212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222012107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82227 + ... + 221822.

It is an arithmetic number, because the mean of its divisors is an integer number (2652988275).

Almost surely, 2^21222012102 is an apocalyptic number.

21222012102 is an abundant number, since it is smaller than the sum of its proper divisors (21225800298).

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

21222012102 is a wasteful number, since it uses less digits than its factorization.

21222012102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315687.

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

Adding to 21222012102 its reverse (20121022212), we get a palindrome (41343034314).

The spelling of 21222012102 in words is "twenty-one billion, two hundred twenty-two million, twelve thousand, one hundred two".