995216021 has 4 divisors (see below), whose sum is σ = 995311200. Its totient is φ = 995120844.

The previous prime is 995215999. The next prime is 995216059. The reversal of 995216021 is 120612599.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 995216021 - 2¹⁸ = 994953877 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 (995212021) 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, 29651 + ... + 53568.

It is an arithmetic number, because the mean of its divisors is an integer number (248827800).

Almost surely, 2^995216021 is an apocalyptic number.

It is an amenable number.

995216021 is a deficient number, since it is larger than the sum of its proper divisors (95179).

995216021 is a wasteful number, since it uses less digits than its factorization.

995216021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95178.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 995216021 is about 31547.0445683902. The cubic root of 995216021 is about 998.4027906137.

The spelling of 995216021 in words is "nine hundred ninety-five million, two hundred sixteen thousand, twenty-one".