21103001212099 has 4 divisors (see below), whose sum is σ = 22213685486440. Its totient is φ = 19992316937760.

The previous prime is 21103001212057. The next prime is 21103001212127. The reversal of 21103001212099 is 99021210030112.

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 21103001212099 - 2²³ = 21102992823491 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 21103001212099.

It is not an unprimeable number, because it can be changed into a prime (21103001212049) 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, 555342137142 + ... + 555342137179.

It is an arithmetic number, because the mean of its divisors is an integer number (5553421371610).

Almost surely, 2^{21103001212099} is an apocalyptic number.

21103001212099 is a deficient number, since it is larger than the sum of its proper divisors (1110684274341).

21103001212099 is a wasteful number, since it uses less digits than its factorization.

21103001212099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110684274340.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21103001212099 in words is "twenty-one trillion, one hundred three billion, one million, two hundred twelve thousand, ninety-nine".