21012110121199 has 16 divisors (see below), whose sum is σ = 21385106828064. Its totient is φ = 20640047068800.

The previous prime is 21012110121127. The next prime is 21012110121239. The reversal of 21012110121199 is 99112101121012.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012110121199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21012110121199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012110121599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199733577 + ... + 199838749.

It is an arithmetic number, because the mean of its divisors is an integer number (1336569176754).

Almost surely, 2^{21012110121199} is an apocalyptic number.

21012110121199 is a deficient number, since it is larger than the sum of its proper divisors (372996706865).

21012110121199 is a wasteful number, since it uses less digits than its factorization.

21012110121199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109578.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 21012110121199 in words is "twenty-one trillion, twelve billion, one hundred ten million, one hundred twenty-one thousand, one hundred ninety-nine".