198021901 has 8 divisors (see below), whose sum is σ = 246884544. Its totient is φ = 154302720.

The previous prime is 198021883. The next prime is 198021919. The reversal of 198021901 is 109120891.

It is an interprime number because it is at equal distance from previous prime (198021883) and next prime (198021919).

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

It is not a de Polignac number, because 198021901 - 2¹⁹ = 197497613 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 (198021961) 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, 1285780 + ... + 1285933.

It is an arithmetic number, because the mean of its divisors is an integer number (30860568).

Almost surely, 2^198021901 is an apocalyptic number.

198021901 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

198021901 is a deficient number, since it is larger than the sum of its proper divisors (48862643).

198021901 is a wasteful number, since it uses less digits than its factorization.

198021901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2571731.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 198021901 is about 14072.0254760997. The cubic root of 198021901 is about 582.8691573423.

The spelling of 198021901 in words is "one hundred ninety-eight million, twenty-one thousand, nine hundred one".