21020200122 has 16 divisors (see below), whose sum is σ = 42258228480. Its totient is φ = 6970428672.

The previous prime is 21020200081. The next prime is 21020200127. The reversal of 21020200122 is 22100202012.

It is a junction number, because it is equal to n+sod(n) for n = 21020200098 and 21020200107.

It is not an unprimeable number, because it can be changed into a prime (21020200127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9074922 + ... + 9077237.

It is an arithmetic number, because the mean of its divisors is an integer number (2641139280).

Almost surely, 2^21020200122 is an apocalyptic number.

21020200122 is an abundant number, since it is smaller than the sum of its proper divisors (21238028358).

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

21020200122 is a wasteful number, since it uses less digits than its factorization.

21020200122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18152357.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21020200122 its reverse (22100202012), we get a palindrome (43120402134).

The spelling of 21020200122 in words is "twenty-one billion, twenty million, two hundred thousand, one hundred twenty-two".