959872021 has 4 divisors (see below), whose sum is σ = 959936832. Its totient is φ = 959807212.

The previous prime is 959872007. The next prime is 959872051. The reversal of 959872021 is 120278959.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120278959 = 281 ⋅428039.

It is a cyclic number.

It is not a de Polignac number, because 959872021 - 2⁹ = 959871509 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 (959872051) 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, 1956 + ... + 43858.

It is an arithmetic number, because the mean of its divisors is an integer number (239984208).

Almost surely, 2^959872021 is an apocalyptic number.

It is an amenable number.

959872021 is a deficient number, since it is larger than the sum of its proper divisors (64811).

959872021 is a wasteful number, since it uses less digits than its factorization.

959872021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64810.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 959872021 is about 30981.8014485924. The cubic root of 959872021 is about 986.4409912070.

The spelling of 959872021 in words is "nine hundred fifty-nine million, eight hundred seventy-two thousand, twenty-one".