21432493068 has 24 divisors (see below), whose sum is σ = 57153315072. Its totient is φ = 6123569424.

The previous prime is 21432493013. The next prime is 21432493073. The reversal of 21432493068 is 86039423412.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127574280 + ... + 127574447.

It is an arithmetic number, because the mean of its divisors is an integer number (2381388128).

Almost surely, 2^21432493068 is an apocalyptic number.

21432493068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21432493068 is an abundant number, since it is smaller than the sum of its proper divisors (35720822004).

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

21432493068 is a wasteful number, since it uses less digits than its factorization.

21432493068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255148741 (or 255148739 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 21432493068 in words is "twenty-one billion, four hundred thirty-two million, four hundred ninety-three thousand, sixty-eight".