21407521199 has 8 divisors (see below), whose sum is σ = 21730029120. Its totient is φ = 21086301600.

The previous prime is 21407521159. The next prime is 21407521241. The reversal of 21407521199 is 99112570412.

It is a happy number.

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 21407521199 - 2³² = 17112553903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21407521159) 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, 288572 + ... + 355089.

It is an arithmetic number, because the mean of its divisors is an integer number (2716253640).

Almost surely, 2^21407521199 is an apocalyptic number.

21407521199 is a deficient number, since it is larger than the sum of its proper divisors (322507921).

21407521199 is an equidigital number, since it uses as much as digits as its factorization.

21407521199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644161.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 21407521199 in words is "twenty-one billion, four hundred seven million, five hundred twenty-one thousand, one hundred ninety-nine".