199800268921 has 8 divisors (see below), whose sum is σ = 218812041504. Its totient is φ = 180929848320.

The previous prime is 199800268907. The next prime is 199800268937. The reversal of 199800268921 is 129862008991.

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-199800268921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199800260921) 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, 35335035 + ... + 35340688.

It is an arithmetic number, because the mean of its divisors is an integer number (27351505188).

Almost surely, 2^199800268921 is an apocalyptic number.

199800268921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199800268921 is a deficient number, since it is larger than the sum of its proper divisors (19011772583).

199800268921 is a wasteful number, since it uses less digits than its factorization.

199800268921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70675991.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The spelling of 199800268921 in words is "one hundred ninety-nine billion, eight hundred million, two hundred sixty-eight thousand, nine hundred twenty-one".