1221133031 has 4 divisors (see below), whose sum is σ = 1231939632. Its totient is φ = 1210326432.

The previous prime is 1221133027. The next prime is 1221133037. The reversal of 1221133031 is 1303311221.

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 1221133031 - 2² = 1221133027 is a prime.

It is a super-2 number, since 2×1221133031² = 2982331758798493922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221133037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5403131 + ... + 5403356.

It is an arithmetic number, because the mean of its divisors is an integer number (307984908).

Almost surely, 2^1221133031 is an apocalyptic number.

1221133031 is a deficient number, since it is larger than the sum of its proper divisors (10806601).

1221133031 is a wasteful number, since it uses less digits than its factorization.

1221133031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10806600.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1221133031 is about 34944.7139207062. The cubic root of 1221133031 is about 1068.8604139497.

Adding to 1221133031 its reverse (1303311221), we get a palindrome (2524444252).

The spelling of 1221133031 in words is "one billion, two hundred twenty-one million, one hundred thirty-three thousand, thirty-one".