21421534799 has 8 divisors (see below), whose sum is σ = 24896699520. Its totient is φ = 18050106456.

The previous prime is 21421534789. The next prime is 21421534891. The reversal of 21421534799 is 99743512412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21421534799 - 2³² = 17126567503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421534759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25933649 + ... + 25934474.

It is an arithmetic number, because the mean of its divisors is an integer number (3112087440).

Almost surely, 2^21421534799 is an apocalyptic number.

21421534799 is a deficient number, since it is larger than the sum of its proper divisors (3475164721).

21421534799 is an equidigital number, since it uses as much as digits as its factorization.

21421534799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51868189.

The product of its digits is 544320, while the sum is 47.

The spelling of 21421534799 in words is "twenty-one billion, four hundred twenty-one million, five hundred thirty-four thousand, seven hundred ninety-nine".