21121101010199 has 4 divisors (see below), whose sum is σ = 21130312133736. Its totient is φ = 21111889886664.

The previous prime is 21121101010181. The next prime is 21121101010253. The reversal of 21121101010199 is 99101010112112.

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-21121101010199 is a prime.

It is a super-2 number, since 2×21121101010199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121101010799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4605558329 + ... + 4605562914.

It is an arithmetic number, because the mean of its divisors is an integer number (5282578033434).

Almost surely, 2^{21121101010199} is an apocalyptic number.

21121101010199 is a deficient number, since it is larger than the sum of its proper divisors (9211123537).

21121101010199 is an equidigital number, since it uses as much as digits as its factorization.

21121101010199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9211123536.

The product of its (nonzero) digits is 324, while the sum is 29.

The spelling of 21121101010199 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, ten thousand, one hundred ninety-nine".