21020001219999 has 12 divisors (see below), whose sum is σ = 30362499523512. Its totient is φ = 14013206974800.

The previous prime is 21020001219989. The next prime is 21020001220007. The reversal of 21020001219999 is 99991210002012.

It is not a de Polignac number, because 21020001219999 - 2⁵ = 21020001219967 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020001219989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9545332 + ... + 11539209.

It is an arithmetic number, because the mean of its divisors is an integer number (2530208293626).

Almost surely, 2^{21020001219999} is an apocalyptic number.

21020001219999 is a deficient number, since it is larger than the sum of its proper divisors (9342498303513).

21020001219999 is a wasteful number, since it uses less digits than its factorization.

21020001219999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21195318 (or 21195315 counting only the distinct ones).

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

The spelling of 21020001219999 in words is "twenty-one trillion, twenty billion, one million, two hundred nineteen thousand, nine hundred ninety-nine".