1211227911364 has 9 divisors (see below), whose sum is σ = 2119652696847. Its totient is φ = 605612855124.

The previous prime is 1211227911359. The next prime is 1211227911371. The reversal of 1211227911364 is 4631197221121.

It is a happy number.

The square root of 1211227911364 is 1100558.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1925977 + ... + 2476255.

Almost surely, 2^{1211227911364} is an apocalyptic number.

1211227911364 is the 1100558-th square number.

It is an amenable number.

1211227911364 is a deficient number, since it is larger than the sum of its proper divisors (908424785483).

1211227911364 is an frugal number, since it uses more digits than its factorization.

1211227911364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100562 (or 550281 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The spelling of 1211227911364 in words is "one trillion, two hundred eleven billion, two hundred twenty-seven million, nine hundred eleven thousand, three hundred sixty-four".