231221378 has 8 divisors (see below), whose sum is σ = 347103372. Its totient is φ = 115520256.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221378 is 873122132.

It can be written as a sum of positive squares in 2 ways, for example, as 151708489 + 79512889 = 12317^2 + 8917^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 231221378.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41975 + ... + 47162.

Almost surely, 2^231221378 is an apocalyptic number.

231221378 is a deficient number, since it is larger than the sum of its proper divisors (115881994).

231221378 is a wasteful number, since it uses less digits than its factorization.

231221378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90436.

The product of its digits is 4032, while the sum is 29.

The square root of 231221378 is about 15205.9652110611. The cubic root of 231221378 is about 613.7751885222.

The spelling of 231221378 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred seventy-eight".