221211244 has 6 divisors (see below), whose sum is σ = 387119684. Its totient is φ = 110605620.

The previous prime is 221211239. The next prime is 221211253. The reversal of 221211244 is 442112122.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27651402 + ... + 27651409.

Almost surely, 2^221211244 is an apocalyptic number.

It is an amenable number.

221211244 is a deficient number, since it is larger than the sum of its proper divisors (165908440).

221211244 is a wasteful number, since it uses less digits than its factorization.

221211244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55302815 (or 55302813 counting only the distinct ones).

The product of its digits is 256, while the sum is 19.

The square root of 221211244 is about 14873.1719548992. The cubic root of 221211244 is about 604.7869331450.

Adding to 221211244 its reverse (442112122), we get a palindrome (663323366).

It can be divided in two parts, 2212 and 11244, that added together give a square (13456 = 116²).

The spelling of 221211244 in words is "two hundred twenty-one million, two hundred eleven thousand, two hundred forty-four".