243221372 has 6 divisors (see below), whose sum is σ = 425637408. Its totient is φ = 121610684.

The previous prime is 243221371. The next prime is 243221393. The reversal of 243221372 is 273122342.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243221371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30402668 + ... + 30402675.

It is an arithmetic number, because the mean of its divisors is an integer number (70939568).

Almost surely, 2^243221372 is an apocalyptic number.

It is an amenable number.

243221372 is a deficient number, since it is larger than the sum of its proper divisors (182416036).

243221372 is a wasteful number, since it uses less digits than its factorization.

243221372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60805347 (or 60805345 counting only the distinct ones).

The product of its digits is 4032, while the sum is 26.

The square root of 243221372 is about 15595.5561619328. The cubic root of 243221372 is about 624.2145841820.

The spelling of 243221372 in words is "two hundred forty-three million, two hundred twenty-one thousand, three hundred seventy-two".