1212328811 has 4 divisors (see below), whose sum is σ = 1251436224. Its totient is φ = 1173221400.

The previous prime is 1212328787. The next prime is 1212328853. The reversal of 1212328811 is 1188232121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212328811 - 2¹⁴ = 1212312427 is a prime.

It is a super-2 number, since 2×1212328811² = 2939482291961347442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212328211) 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, 19553660 + ... + 19553721.

It is an arithmetic number, because the mean of its divisors is an integer number (312859056).

Almost surely, 2^1212328811 is an apocalyptic number.

1212328811 is a deficient number, since it is larger than the sum of its proper divisors (39107413).

1212328811 is an equidigital number, since it uses as much as digits as its factorization.

1212328811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39107412.

The product of its digits is 1536, while the sum is 29.

The square root of 1212328811 is about 34818.5124754060. The cubic root of 1212328811 is about 1066.2854312183.

The spelling of 1212328811 in words is "one billion, two hundred twelve million, three hundred twenty-eight thousand, eight hundred eleven".