221742436 has 12 divisors (see below), whose sum is σ = 389597040. Its totient is φ = 110429000.

The previous prime is 221742431. The next prime is 221742449. The reversal of 221742436 is 634247122.

It is a happy number.

221742436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221742398 and 221742407.

It is not an unprimeable number, because it can be changed into a prime (221742431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109426 + ... + 111433.

It is an arithmetic number, because the mean of its divisors is an integer number (32466420).

Almost surely, 2^221742436 is an apocalyptic number.

It is an amenable number.

221742436 is a deficient number, since it is larger than the sum of its proper divisors (167854604).

221742436 is a wasteful number, since it uses less digits than its factorization.

221742436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221114 (or 221112 counting only the distinct ones).

The product of its digits is 16128, while the sum is 31.

The square root of 221742436 is about 14891.0186354057. The cubic root of 221742436 is about 605.2706354695.

Adding to 221742436 its reverse (634247122), we get a palindrome (855989558).

The spelling of 221742436 in words is "two hundred twenty-one million, seven hundred forty-two thousand, four hundred thirty-six".