221396261 has 8 divisors (see below), whose sum is σ = 225765600. Its totient is φ = 217047600.

The previous prime is 221396257. The next prime is 221396297. The reversal of 221396261 is 162693122.

It is a happy number.

221396261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221396261 - 2² = 221396257 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 (221396221) 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, 17411 + ... + 27311.

It is an arithmetic number, because the mean of its divisors is an integer number (28220700).

Almost surely, 2^221396261 is an apocalyptic number.

It is an amenable number.

221396261 is a deficient number, since it is larger than the sum of its proper divisors (4369339).

221396261 is an equidigital number, since it uses as much as digits as its factorization.

221396261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10339.

The product of its digits is 7776, while the sum is 32.

The square root of 221396261 is about 14879.3904781076. The cubic root of 221396261 is about 604.9554970339.

The spelling of 221396261 in words is "two hundred twenty-one million, three hundred ninety-six thousand, two hundred sixty-one".