21432010400 has 36 divisors (see below), whose sum is σ = 52320897342. Its totient is φ = 8572803840.

The previous prime is 21432010373. The next prime is 21432010433. The reversal of 21432010400 is 401023412.

It can be written as a sum of positive squares in 3 ways, for example, as 20342746384 + 1089264016 = 142628^2 + 33004^2 .

It is an unprimeable number.

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, 13394207 + ... + 13395806.

Almost surely, 2^21432010400 is an apocalyptic number.

21432010400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21432010400 is an abundant number, since it is smaller than the sum of its proper divisors (30888886942).

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

21432010400 is a wasteful number, since it uses less digits than its factorization.

21432010400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26790033 (or 26790020 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21432010400 its reverse (401023412), we get a palindrome (21833033812).

The spelling of 21432010400 in words is "twenty-one billion, four hundred thirty-two million, ten thousand, four hundred".