21321242199 has 16 divisors (see below), whose sum is σ = 31682467840. Its totient is φ = 14171212440.

The previous prime is 21321242123. The next prime is 21321242207. The reversal of 21321242199 is 99124212312.

21321242199 is a `hidden beast` number, since 2 + 1 + 321 + 242 + 1 + 99 = 666.

It is not a de Polignac number, because 21321242199 - 2¹⁷ = 21321111127 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 (21321242399) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1183927 + ... + 1201800.

It is an arithmetic number, because the mean of its divisors is an integer number (1980154240).

Almost surely, 2^21321242199 is an apocalyptic number.

21321242199 is a deficient number, since it is larger than the sum of its proper divisors (10361225641).

21321242199 is a wasteful number, since it uses less digits than its factorization.

21321242199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386067 (or 2386061 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The spelling of 21321242199 in words is "twenty-one billion, three hundred twenty-one million, two hundred forty-two thousand, one hundred ninety-nine".