195237721 has 12 divisors (see below), whose sum is σ = 230566656. Its totient is φ = 161942760.

The previous prime is 195237719. The next prime is 195237737. The reversal of 195237721 is 127732591.

It is not a de Polignac number, because 195237721 - 2¹ = 195237719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195237701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7785 + ... + 21238.

It is an arithmetic number, because the mean of its divisors is an integer number (19213888).

Almost surely, 2^195237721 is an apocalyptic number.

It is an amenable number.

195237721 is a deficient number, since it is larger than the sum of its proper divisors (35328935).

195237721 is an equidigital number, since it uses as much as digits as its factorization.

195237721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29092 (or 29061 counting only the distinct ones).

The product of its digits is 26460, while the sum is 37.

The square root of 195237721 is about 13972.7492284088. The cubic root of 195237721 is about 580.1245481637.

The spelling of 195237721 in words is "one hundred ninety-five million, two hundred thirty-seven thousand, seven hundred twenty-one".