21012212199 has 32 divisors (see below), whose sum is σ = 31405121280. Its totient is φ = 12384230400.

The previous prime is 21012212159. The next prime is 21012212203. The reversal of 21012212199 is 99121221012.

It is not a de Polignac number, because 21012212199 - 2³² = 16717244903 is a prime.

It is a super-2 number, since 2×21012212199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012212159) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3710232 + ... + 3715890.

It is an arithmetic number, because the mean of its divisors is an integer number (981410040).

Almost surely, 2^21012212199 is an apocalyptic number.

21012212199 is a deficient number, since it is larger than the sum of its proper divisors (10392909081).

21012212199 is a wasteful number, since it uses less digits than its factorization.

21012212199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8751.

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

The spelling of 21012212199 in words is "twenty-one billion, twelve million, two hundred twelve thousand, one hundred ninety-nine".