1221330311 has 8 divisors (see below), whose sum is σ = 1231750800. Its totient is φ = 1210933440.

The previous prime is 1221330301. The next prime is 1221330377. The reversal of 1221330311 is 1130331221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221330311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221330311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221330301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107021 + ... + 117881.

It is an arithmetic number, because the mean of its divisors is an integer number (153968850).

Almost surely, 2^1221330311 is an apocalyptic number.

1221330311 is a deficient number, since it is larger than the sum of its proper divisors (10420489).

1221330311 is a wasteful number, since it uses less digits than its factorization.

1221330311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11809.

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

The square root of 1221330311 is about 34947.5365512363. The cubic root of 1221330311 is about 1068.9179707222.

Adding to 1221330311 its reverse (1130331221), we get a palindrome (2351661532).

It can be divided in two parts, 12213 and 30311, that added together give a palindrome (42524).

The spelling of 1221330311 in words is "one billion, two hundred twenty-one million, three hundred thirty thousand, three hundred eleven".