21423233100 has 72 divisors (see below), whose sum is σ = 63659845648. Its totient is φ = 5558457600.

The previous prime is 21423233057. The next prime is 21423233101. The reversal of 21423233100 is 133232412.

It is a super-2 number, since 2×21423233100² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21423233101) 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, 953911 + ... + 976110.

Almost surely, 2^21423233100 is an apocalyptic number.

21423233100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423233100 is an abundant number, since it is smaller than the sum of its proper divisors (42236612548).

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

21423233100 is a wasteful number, since it uses less digits than its factorization.

21423233100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1930075 (or 1930068 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21423233100 its reverse (133232412), we get a palindrome (21556465512).

The spelling of 21423233100 in words is "twenty-one billion, four hundred twenty-three million, two hundred thirty-three thousand, one hundred".