21212000109999 has 24 divisors (see below), whose sum is σ = 32252676783600. Its totient is φ = 13396839661440.

The previous prime is 21212000109991. The next prime is 21212000110013. The reversal of 21212000109999 is 99990100021212.

It is not a de Polignac number, because 21212000109999 - 2³ = 21212000109991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212000109991) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10166179 + ... + 12073739.

It is an arithmetic number, because the mean of its divisors is an integer number (1343861532650).

Almost surely, 2^{21212000109999} is an apocalyptic number.

21212000109999 is a deficient number, since it is larger than the sum of its proper divisors (11040676673601).

21212000109999 is a wasteful number, since it uses less digits than its factorization.

21212000109999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1972615 (or 1972612 counting only the distinct ones).

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

The spelling of 21212000109999 in words is "twenty-one trillion, two hundred twelve billion, one hundred nine thousand, nine hundred ninety-nine".