21122109999 has 48 divisors (see below), whose sum is σ = 31386700800. Its totient is φ = 13683653568.

The previous prime is 21122109959. The next prime is 21122110001. The reversal of 21122109999 is 99990122112.

It is not a de Polignac number, because 21122109999 - 2³³ = 12532175407 is a prime.

It is a super-2 number, since 2×21122109999² (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 (21122109929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21185169 + ... + 21186165.

It is an arithmetic number, because the mean of its divisors is an integer number (653889600).

Almost surely, 2^21122109999 is an apocalyptic number.

21122109999 is a deficient number, since it is larger than the sum of its proper divisors (10264590801).

21122109999 is a wasteful number, since it uses less digits than its factorization.

21122109999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524 (or 1521 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 21122109999 in words is "twenty-one billion, one hundred twenty-two million, one hundred nine thousand, nine hundred ninety-nine".