995220221 has 2 divisors, whose sum is σ = 995220222. Its totient is φ = 995220220.

The previous prime is 995220217. The next prime is 995220223. The reversal of 995220221 is 122022599.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 993132196 + 2088025 = 31514^2 + 1445^2 .

It is an emirp because it is prime and its reverse (122022599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 995220221 - 2² = 995220217 is a prime.

Together with 995220223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (995220223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497610110 + 497610111.

It is an arithmetic number, because the mean of its divisors is an integer number (497610111).

Almost surely, 2^995220221 is an apocalyptic number.

It is an amenable number.

995220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

995220221 is an equidigital number, since it uses as much as digits as its factorization.

995220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 995220221 is about 31547.1111355699. Note that the first 4 decimals coincide. The cubic root of 995220221 is about 998.4041950947.

The spelling of 995220221 in words is "nine hundred ninety-five million, two hundred twenty thousand, two hundred twenty-one".