21421024120 has 16 divisors (see below), whose sum is σ = 48197304360. Its totient is φ = 8568409632.

The previous prime is 21421024117. The next prime is 21421024129. The reversal of 21421024120 is 2142012412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421024129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 267762762 + ... + 267762841.

Almost surely, 2^21421024120 is an apocalyptic number.

21421024120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21421024120 is an abundant number, since it is smaller than the sum of its proper divisors (26776280240).

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

21421024120 is a wasteful number, since it uses less digits than its factorization.

21421024120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535525614 (or 535525610 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21421024120 its reverse (2142012412), we get a palindrome (23563036532).

The spelling of 21421024120 in words is "twenty-one billion, four hundred twenty-one million, twenty-four thousand, one hundred twenty".