196922921 has 4 divisors (see below), whose sum is σ = 212070852. Its totient is φ = 181774992.

The previous prime is 196922911. The next prime is 196922933. The reversal of 196922921 is 129229691.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111619225 + 85303696 = 10565^2 + 9236^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196922921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196922911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7573946 + ... + 7573971.

It is an arithmetic number, because the mean of its divisors is an integer number (53017713).

Almost surely, 2^196922921 is an apocalyptic number.

It is an amenable number.

196922921 is a deficient number, since it is larger than the sum of its proper divisors (15147931).

196922921 is a wasteful number, since it uses less digits than its factorization.

196922921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15147930.

The product of its digits is 34992, while the sum is 41.

The square root of 196922921 is about 14032.9227532970. The cubic root of 196922921 is about 581.7888892768.

The spelling of 196922921 in words is "one hundred ninety-six million, nine hundred twenty-two thousand, nine hundred twenty-one".