196122721 has 8 divisors (see below), whose sum is σ = 201356064. Its totient is φ = 190910880.

The previous prime is 196122713. The next prime is 196122733. The reversal of 196122721 is 127221691.

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

It is a cyclic number.

It is not a de Polignac number, because 196122721 - 2³ = 196122713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (196122781) 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, 14026 + ... + 24268.

It is an arithmetic number, because the mean of its divisors is an integer number (25169508).

Almost surely, 2^196122721 is an apocalyptic number.

It is an amenable number.

196122721 is a deficient number, since it is larger than the sum of its proper divisors (5233343).

196122721 is a wasteful number, since it uses less digits than its factorization.

196122721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10751.

The product of its digits is 3024, while the sum is 31.

The square root of 196122721 is about 14004.3822070093. The cubic root of 196122721 is about 580.9997827552. Note that the first 3 decimals are identical.

The spelling of 196122721 in words is "one hundred ninety-six million, one hundred twenty-two thousand, seven hundred twenty-one".