21122331100 has 72 divisors (see below), whose sum is σ = 50411648448. Its totient is φ = 7633056000.

The previous prime is 21122331079. The next prime is 21122331101. The reversal of 21122331100 is 113322112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122331101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111751 + ... + 233950.

It is an arithmetic number, because the mean of its divisors is an integer number (700161784).

Almost surely, 2^21122331100 is an apocalyptic number.

21122331100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122331100 is an abundant number, since it is smaller than the sum of its proper divisors (29289317348).

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

21122331100 is a wasteful number, since it uses less digits than its factorization.

21122331100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345775 (or 345768 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21122331100 its reverse (113322112), we get a palindrome (21235653212).

The spelling of 21122331100 in words is "twenty-one billion, one hundred twenty-two million, three hundred thirty-one thousand, one hundred".