21000122022 has 16 divisors (see below), whose sum is σ = 45818448192. Its totient is φ = 6363673320.

The previous prime is 21000121997. The next prime is 21000122027. The reversal of 21000122022 is 22022100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000121989 and 21000122007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000122027) 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, 159091768 + ... + 159091899.

It is an arithmetic number, because the mean of its divisors is an integer number (2863653012).

Almost surely, 2^21000122022 is an apocalyptic number.

21000122022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000122022 is an abundant number, since it is smaller than the sum of its proper divisors (24818326170).

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

21000122022 is a wasteful number, since it uses less digits than its factorization.

21000122022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318183683.

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

Adding to 21000122022 its reverse (22022100012), we get a palindrome (43022222034).

The spelling of 21000122022 in words is "twenty-one billion, one hundred twenty-two thousand, twenty-two".