196313821 has 4 divisors (see below), whose sum is σ = 214160544. Its totient is φ = 178467100.

The previous prime is 196313753. The next prime is 196313851. The reversal of 196313821 is 128313691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128313691 = 11 ⋅11664881.

It is a cyclic number.

It is not a de Polignac number, because 196313821 - 2⁷ = 196313693 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 (196313851) 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, 8923345 + ... + 8923366.

It is an arithmetic number, because the mean of its divisors is an integer number (53540136).

Almost surely, 2^196313821 is an apocalyptic number.

196313821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

196313821 is a deficient number, since it is larger than the sum of its proper divisors (17846723).

196313821 is a wasteful number, since it uses less digits than its factorization.

196313821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17846722.

The product of its digits is 7776, while the sum is 34.

The square root of 196313821 is about 14011.2034101286. The cubic root of 196313821 is about 581.1884282719.

The spelling of 196313821 in words is "one hundred ninety-six million, three hundred thirteen thousand, eight hundred twenty-one".