21432663120 has 80 divisors (see below), whose sum is σ = 72481378752. Its totient is φ = 5195796480.

The previous prime is 21432663103. The next prime is 21432663127. The reversal of 21432663120 is 2136623412.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-4 number, since 4×21432663120⁴ (a number of 42 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21432663127) 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, 4056577 + ... + 4061856.

Almost surely, 2^21432663120 is an apocalyptic number.

21432663120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432663120 is an abundant number, since it is smaller than the sum of its proper divisors (51048715632).

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

21432663120 is a wasteful number, since it uses less digits than its factorization.

21432663120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8118460 (or 8118454 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The spelling of 21432663120 in words is "twenty-one billion, four hundred thirty-two million, six hundred sixty-three thousand, one hundred twenty".