21402000432 has 30 divisors (see below), whose sum is σ = 59895876612. Its totient is φ = 7134000096.

The previous prime is 21402000427. The next prime is 21402000439. The reversal of 21402000432 is 23400020412.

21402000432 is a `hidden beast` number, since 214 + 0 + 20 + 0 + 0 + 432 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21402000439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74312358 + ... + 74312645.

Almost surely, 2^21402000432 is an apocalyptic number.

It is an amenable number.

21402000432 is an abundant number, since it is smaller than the sum of its proper divisors (38493876180).

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

21402000432 is a wasteful number, since it uses less digits than its factorization.

21402000432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148625017 (or 148625008 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21402000432 its reverse (23400020412), we get a palindrome (44802020844).

The spelling of 21402000432 in words is "twenty-one billion, four hundred two million, four hundred thirty-two", and thus it is an aban number.