21002031199 has 8 divisors (see below), whose sum is σ = 21030180272. Its totient is φ = 20973902400.

The previous prime is 21002031191. The next prime is 21002031221. The reversal of 21002031199 is 99113020012.

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 21002031199 - 2³ = 21002031191 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 (21002031191) 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, 3455227 + ... + 3461299.

It is an arithmetic number, because the mean of its divisors is an integer number (2628772534).

Almost surely, 2^21002031199 is an apocalyptic number.

21002031199 is a deficient number, since it is larger than the sum of its proper divisors (28149073).

21002031199 is a wasteful number, since it uses less digits than its factorization.

21002031199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10137.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 21002031199 in words is "twenty-one billion, two million, thirty-one thousand, one hundred ninety-nine".