21020122122 has 16 divisors (see below), whose sum is σ = 42667711392. Its totient is φ = 6902129520.

The previous prime is 21020122093. The next prime is 21020122129. The reversal of 21020122122 is 22122102012.

It is not an unprimeable number, because it can be changed into a prime (21020122129) 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, 26144029 + ... + 26144832.

It is an arithmetic number, because the mean of its divisors is an integer number (2666731962).

Almost surely, 2^21020122122 is an apocalyptic number.

21020122122 is an abundant number, since it is smaller than the sum of its proper divisors (21647589270).

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

21020122122 is a wasteful number, since it uses less digits than its factorization.

21020122122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52288933.

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

Adding to 21020122122 its reverse (22122102012), we get a palindrome (43142224134).

The spelling of 21020122122 in words is "twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-two".