1221075272 has 8 divisors (see below), whose sum is σ = 2289516150. Its totient is φ = 610537632.

The previous prime is 1221075227. The next prime is 1221075281. The reversal of 1221075272 is 2725701221.

It can be written as a sum of positive squares in only one way, i.e., 839029156 + 382046116 = 28966^2 + 19546^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76317197 + ... + 76317212.

Almost surely, 2^1221075272 is an apocalyptic number.

It is an amenable number.

1221075272 is a deficient number, since it is larger than the sum of its proper divisors (1068440878).

1221075272 is a wasteful number, since it uses less digits than its factorization.

1221075272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152634415 (or 152634411 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 1221075272 is about 34943.8874769251. The cubic root of 1221075272 is about 1068.8435614910.

Adding to 1221075272 its reverse (2725701221), we get a palindrome (3946776493).

The spelling of 1221075272 in words is "one billion, two hundred twenty-one million, seventy-five thousand, two hundred seventy-two".