1216022272 has 18 divisors (see below), whose sum is σ = 2427294968. Its totient is φ = 608011008.

The previous prime is 1216022261. The next prime is 1216022323. The reversal of 1216022272 is 2722206121.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2374788 + ... + 2375299.

Almost surely, 2^1216022272 is an apocalyptic number.

It is an amenable number.

1216022272 is a deficient number, since it is larger than the sum of its proper divisors (1211272696).

1216022272 is an frugal number, since it uses more digits than its factorization.

1216022272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4750103 (or 4750089 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1216022272 is about 34871.5108935647. The cubic root of 1216022272 is about 1067.3671759667.

Adding to 1216022272 its reverse (2722206121), we get a palindrome (3938228393).

The spelling of 1216022272 in words is "one billion, two hundred sixteen million, twenty-two thousand, two hundred seventy-two".