21224433100 has 72 divisors (see below), whose sum is σ = 50809747968. Its totient is φ = 7645555200.

The previous prime is 21224433091. The next prime is 21224433119. The reversal of 21224433100 is 133442212.

It is a super-2 number, since 2×21224433100² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145804 + ... + 252403.

It is an arithmetic number, because the mean of its divisors is an integer number (705690944).

Almost surely, 2^21224433100 is an apocalyptic number.

21224433100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21224433100 is an abundant number, since it is smaller than the sum of its proper divisors (29585314868).

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

21224433100 is a wasteful number, since it uses less digits than its factorization.

21224433100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398275 (or 398268 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21224433100 its reverse (133442212), we get a palindrome (21357875312).

The spelling of 21224433100 in words is "twenty-one billion, two hundred twenty-four million, four hundred thirty-three thousand, one hundred".