231721920074 has 8 divisors (see below), whose sum is σ = 348115168260. Its totient is φ = 115683530656.

The previous prime is 231721920071. The next prime is 231721920083. The reversal of 231721920074 is 470029127132.

It can be written as a sum of positive squares in 2 ways, for example, as 201562387849 + 30159532225 = 448957^2 + 173665^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (231721920071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88713059 + ... + 88715670.

Almost surely, 2^231721920074 is an apocalyptic number.

231721920074 is a deficient number, since it is larger than the sum of its proper divisors (116393248186).

231721920074 is a wasteful number, since it uses less digits than its factorization.

231721920074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177429384.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 231721920074 in words is "two hundred thirty-one billion, seven hundred twenty-one million, nine hundred twenty thousand, seventy-four".