216822901 has 4 divisors (see below), whose sum is σ = 216917632. Its totient is φ = 216728172.

The previous prime is 216822887. The next prime is 216822911. The reversal of 216822901 is 109228612.

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.

It is a cyclic number.

It is not a de Polignac number, because 216822901 - 2⁵ = 216822869 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 (216822911) 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, 43845 + ... + 48538.

It is an arithmetic number, because the mean of its divisors is an integer number (54229408).

Almost surely, 2^216822901 is an apocalyptic number.

It is an amenable number.

216822901 is a deficient number, since it is larger than the sum of its proper divisors (94731).

216822901 is an equidigital number, since it uses as much as digits as its factorization.

216822901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94730.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 216822901 is about 14724.9075039540. The cubic root of 216822901 is about 600.7609798119.

The spelling of 216822901 in words is "two hundred sixteen million, eight hundred twenty-two thousand, nine hundred one".