21002000222122 has 4 divisors (see below), whose sum is σ = 31503000333186. Its totient is φ = 10501000111060.

The previous prime is 21002000222113. The next prime is 21002000222167. The reversal of 21002000222122 is 22122200020012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20995008084961 + 6992137161 = 4582031^2 + 83619^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21002000222096 and 21002000222105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250500055529 + ... + 5250500055532.

Almost surely, 2^{21002000222122} is an apocalyptic number.

21002000222122 is a deficient number, since it is larger than the sum of its proper divisors (10501000111064).

21002000222122 is a wasteful number, since it uses less digits than its factorization.

21002000222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501000111063.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21002000222122 its reverse (22122200020012), we get a palindrome (43124200242134).

The spelling of 21002000222122 in words is "twenty-one trillion, two billion, two hundred twenty-two thousand, one hundred twenty-two".