198456021 has 16 divisors (see below), whose sum is σ = 294286720. Its totient is φ = 132179040.

The previous prime is 198455993. The next prime is 198456053. The reversal of 198456021 is 120654891.

198456021 is a `hidden beast` number, since 1 + 9 + 8 + 45 + 602 + 1 = 666.

It is not a de Polignac number, because 198456021 - 2⁵ = 198455989 is a prime.

It is a super-3 number, since 3×198456021³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198456061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32361 + ... + 38001.

It is an arithmetic number, because the mean of its divisors is an integer number (18392920).

Almost surely, 2^198456021 is an apocalyptic number.

It is an amenable number.

198456021 is a deficient number, since it is larger than the sum of its proper divisors (95830699).

198456021 is a wasteful number, since it uses less digits than its factorization.

198456021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953 (or 6947 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 198456021 is about 14087.4419608387. The cubic root of 198456021 is about 583.2947844639.

The spelling of 198456021 in words is "one hundred ninety-eight million, four hundred fifty-six thousand, twenty-one".