20212100999 has 4 divisors (see below), whose sum is σ = 20295968880. Its totient is φ = 20128233120.

The previous prime is 20212100981. The next prime is 20212101001. The reversal of 20212100999 is 99900121202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212100999 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 (20212100929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41933579 + ... + 41934060.

It is an arithmetic number, because the mean of its divisors is an integer number (5073992220).

Almost surely, 2^20212100999 is an apocalyptic number.

20212100999 is a deficient number, since it is larger than the sum of its proper divisors (83867881).

20212100999 is an equidigital number, since it uses as much as digits as its factorization.

20212100999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83867880.

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 20212100999 in words is "twenty billion, two hundred twelve million, one hundred thousand, nine hundred ninety-nine".