1221023133 has 32 divisors (see below), whose sum is σ = 2037043200. Its totient is φ = 716137200.

The previous prime is 1221023017. The next prime is 1221023159. The reversal of 1221023133 is 3313201221.

It is not a de Polignac number, because 1221023133 - 2²² = 1216828829 is a prime.

It is a super-2 number, since 2×1221023133² = 2981794982642271378, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221023633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57103 + ... + 75516.

It is an arithmetic number, because the mean of its divisors is an integer number (63657600).

Almost surely, 2^1221023133 is an apocalyptic number.

It is an amenable number.

1221023133 is a deficient number, since it is larger than the sum of its proper divisors (816020067).

1221023133 is a wasteful number, since it uses less digits than its factorization.

1221023133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132670 (or 132664 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1221023133 is about 34943.1414300432. The cubic root of 1221023133 is about 1068.8283483344.

Adding to 1221023133 its reverse (3313201221), we get a palindrome (4534224354).

The spelling of 1221023133 in words is "one billion, two hundred twenty-one million, twenty-three thousand, one hundred thirty-three".