1221333011 has 2 divisors, whose sum is σ = 1221333012. Its totient is φ = 1221333010.

The previous prime is 1221332993. The next prime is 1221333019. The reversal of 1221333011 is 1103331221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1103331221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221333011 - 2¹⁰ = 1221331987 is a prime.

It is a super-2 number, since 2×1221333011² = 2983308647516652242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221333019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610666505 + 610666506.

It is an arithmetic number, because the mean of its divisors is an integer number (610666506).

Almost surely, 2^1221333011 is an apocalyptic number.

1221333011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221333011 is an equidigital number, since it uses as much as digits as its factorization.

1221333011 is an evil number, because the sum of its binary digits is even.

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

The square root of 1221333011 is about 34947.5751805472. The cubic root of 1221333011 is about 1068.9187584087.

Adding to 1221333011 its reverse (1103331221), we get a palindrome (2324664232).

The spelling of 1221333011 in words is "one billion, two hundred twenty-one million, three hundred thirty-three thousand, eleven".