1221300133 has 4 divisors (see below), whose sum is σ = 1224134208. Its totient is φ = 1218466060.

The previous prime is 1221300127. The next prime is 1221300139. The reversal of 1221300133 is 3310031221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1221300127) and next prime (1221300139).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221300133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221300139) 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, 1416391 + ... + 1417252.

It is an arithmetic number, because the mean of its divisors is an integer number (306033552).

Almost surely, 2^1221300133 is an apocalyptic number.

It is an amenable number.

1221300133 is a deficient number, since it is larger than the sum of its proper divisors (2834075).

1221300133 is an equidigital number, since it uses as much as digits as its factorization.

1221300133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2834074.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1221300133 is about 34947.1047870922. The cubic root of 1221300133 is about 1068.9091666414.

Adding to 1221300133 its reverse (3310031221), we get a palindrome (4531331354).

The spelling of 1221300133 in words is "one billion, two hundred twenty-one million, three hundred thousand, one hundred thirty-three".