196920921 has 8 divisors (see below), whose sum is σ = 276380320. Its totient is φ = 124371072.

The previous prime is 196920901. The next prime is 196920947. The reversal of 196920921 is 129029691.

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

It is not a de Polignac number, because 196920921 - 2⁷ = 196920793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 196920921.

It is not an unprimeable number, because it can be changed into a prime (196920901) 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, 1727320 + ... + 1727433.

It is an arithmetic number, because the mean of its divisors is an integer number (34547540).

Almost surely, 2^196920921 is an apocalyptic number.

It is an amenable number.

196920921 is a deficient number, since it is larger than the sum of its proper divisors (79459399).

196920921 is a wasteful number, since it uses less digits than its factorization.

196920921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454775.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 196920921 is about 14032.8514921238. The cubic root of 196920921 is about 581.7869196707.

The spelling of 196920921 in words is "one hundred ninety-six million, nine hundred twenty thousand, nine hundred twenty-one".