21040120099 has 8 divisors (see below), whose sum is σ = 21306318848. Its totient is φ = 20775492360.

The previous prime is 21040120093. The next prime is 21040120111. The reversal of 21040120099 is 99002104012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21040120099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21040120093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365787 + ... + 419380.

It is an arithmetic number, because the mean of its divisors is an integer number (2663289856).

Almost surely, 2^21040120099 is an apocalyptic number.

21040120099 is a deficient number, since it is larger than the sum of its proper divisors (266198749).

21040120099 is a wasteful number, since it uses less digits than its factorization.

21040120099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785505.

The product of its (nonzero) digits is 1296, while the sum is 28.

The spelling of 21040120099 in words is "twenty-one billion, forty million, one hundred twenty thousand, ninety-nine".