21423100120 has 64 divisors (see below), whose sum is σ = 51652429920. Its totient is φ = 7967975424.

The previous prime is 21423100099. The next prime is 21423100129. The reversal of 21423100120 is 2100132412.

It is a junction number, because it is equal to n+sod(n) for n = 21423100094 and 21423100103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423100129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133347 + ... + 246226.

Almost surely, 2^21423100120 is an apocalyptic number.

21423100120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21423100120 is an abundant number, since it is smaller than the sum of its proper divisors (30229329800).

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

21423100120 is a wasteful number, since it uses less digits than its factorization.

21423100120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379684 (or 379680 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21423100120 its reverse (2100132412), we get a palindrome (23523232532).

The spelling of 21423100120 in words is "twenty-one billion, four hundred twenty-three million, one hundred thousand, one hundred twenty".