21000122196 has 48 divisors (see below), whose sum is σ = 49252056000. Its totient is φ = 6964157952.

The previous prime is 21000122183. The next prime is 21000122197. The reversal of 21000122196 is 69122100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000122197) 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 15 ways as a sum of consecutive naturals, for example, 2171580 + ... + 2181228.

It is an arithmetic number, because the mean of its divisors is an integer number (1026084500).

Almost surely, 2^21000122196 is an apocalyptic number.

It is an amenable number.

21000122196 is an abundant number, since it is smaller than the sum of its proper divisors (28251933804).

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

21000122196 is a wasteful number, since it uses less digits than its factorization.

21000122196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10568 (or 10566 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The spelling of 21000122196 in words is "twenty-one billion, one hundred twenty-two thousand, one hundred ninety-six".