21012120119999 has 4 divisors (see below), whose sum is σ = 21069373853664. Its totient is φ = 20954866386336.

The previous prime is 21012120119971. The next prime is 21012120120001. The reversal of 21012120119999 is 99991102121012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012120119999 - 2⁸ = 21012120119743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012120119929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28626866282 + ... + 28626867015.

It is an arithmetic number, because the mean of its divisors is an integer number (5267343463416).

Almost surely, 2^{21012120119999} is an apocalyptic number.

21012120119999 is a deficient number, since it is larger than the sum of its proper divisors (57253733665).

21012120119999 is an equidigital number, since it uses as much as digits as its factorization.

21012120119999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57253733664.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 21012120119999 in words is "twenty-one trillion, twelve billion, one hundred twenty million, one hundred nineteen thousand, nine hundred ninety-nine".