21021111219999 has 32 divisors (see below), whose sum is σ = 30602297456640. Its totient is φ = 12729180684800.

The previous prime is 21021111219869. The next prime is 21021111220007. The reversal of 21021111219999 is 99991211112012.

It is a cyclic number.

It is not a de Polignac number, because 21021111219999 - 2³⁶ = 20952391743263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021111219599) 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, 295499467 + ... + 295570595.

It is an arithmetic number, because the mean of its divisors is an integer number (956321795520).

Almost surely, 2^{21021111219999} is an apocalyptic number.

21021111219999 is a deficient number, since it is larger than the sum of its proper divisors (9581186236641).

21021111219999 is a wasteful number, since it uses less digits than its factorization.

21021111219999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78671.

The product of its (nonzero) digits is 52488, while the sum is 48.

The spelling of 21021111219999 in words is "twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred nineteen thousand, nine hundred ninety-nine".