21012122199 has 8 divisors (see below), whose sum is σ = 28040257152. Its totient is φ = 13996034360.

The previous prime is 21012122191. The next prime is 21012122227. The reversal of 21012122199 is 99122121012.

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 21012122199 - 2³ = 21012122191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012122191) 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, 3007707 + ... + 3014684.

It is an arithmetic number, because the mean of its divisors is an integer number (3505032144).

Almost surely, 2^21012122199 is an apocalyptic number.

21012122199 is a deficient number, since it is larger than the sum of its proper divisors (7028134953).

21012122199 is a wasteful number, since it uses less digits than its factorization.

21012122199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6023557.

The product of its (nonzero) digits is 1296, while the sum is 30.

The spelling of 21012122199 in words is "twenty-one billion, twelve million, one hundred twenty-two thousand, one hundred ninety-nine".