21020122202102 has 4 divisors (see below), whose sum is σ = 31530183303156. Its totient is φ = 10510061101050.

The previous prime is 21020122202063. The next prime is 21020122202141. The reversal of 21020122202102 is 20120222102012.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (21020122202063) and next prime (21020122202141).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255030550524 + ... + 5255030550527.

It is an arithmetic number, because the mean of its divisors is an integer number (7882545825789).

Almost surely, 2^{21020122202102} is an apocalyptic number.

21020122202102 is a deficient number, since it is larger than the sum of its proper divisors (10510061101054).

21020122202102 is a wasteful number, since it uses less digits than its factorization.

21020122202102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10510061101053.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21020122202102 its reverse (20120222102012), we get a palindrome (41140344304114).

The spelling of 21020122202102 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, two hundred two thousand, one hundred two".