1201100021999 has 4 divisors (see below), whose sum is σ = 1226655341664. Its totient is φ = 1175544702336.

The previous prime is 1201100021963. The next prime is 1201100022037. The reversal of 1201100021999 is 9991200011021.

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 1201100021999 - 2⁸ = 1201100021743 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 (1201100021929) 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, 12777659762 + ... + 12777659855.

It is an arithmetic number, because the mean of its divisors is an integer number (306663835416).

Almost surely, 2^{1201100021999} is an apocalyptic number.

1201100021999 is a deficient number, since it is larger than the sum of its proper divisors (25555319665).

1201100021999 is an equidigital number, since it uses as much as digits as its factorization.

1201100021999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25555319664.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 1201100021999 in words is "one trillion, two hundred one billion, one hundred million, twenty-one thousand, nine hundred ninety-nine".