195950021 has 8 divisors (see below), whose sum is σ = 206608800. Its totient is φ = 185325840.

The previous prime is 195950017. The next prime is 195950081. The reversal of 195950021 is 120059591.

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 195950021 - 2² = 195950017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 195950021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195950081) 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, 3431 + ... + 20091.

It is an arithmetic number, because the mean of its divisors is an integer number (25826100).

Almost surely, 2^195950021 is an apocalyptic number.

It is an amenable number.

195950021 is a deficient number, since it is larger than the sum of its proper divisors (10658779).

195950021 is a wasteful number, since it uses less digits than its factorization.

195950021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17299.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 195950021 is about 13998.2149219106. The cubic root of 195950021 is about 580.8291954682.

The spelling of 195950021 in words is "one hundred ninety-five million, nine hundred fifty thousand, twenty-one".