1221130233 has 6 divisors (see below), whose sum is σ = 1763854794. Its totient is φ = 814086816.

The previous prime is 1221130201. The next prime is 1221130291. The reversal of 1221130233 is 3320311221.

It can be written as a sum of positive squares in only one way, i.e., 684188649 + 536941584 = 26157^2 + 23172^2 .

It is not a de Polignac number, because 1221130233 - 2⁵ = 1221130201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221130333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67840560 + ... + 67840577.

It is an arithmetic number, because the mean of its divisors is an integer number (293975799).

Almost surely, 2^1221130233 is an apocalyptic number.

It is an amenable number.

1221130233 is a deficient number, since it is larger than the sum of its proper divisors (542724561).

1221130233 is a wasteful number, since it uses less digits than its factorization.

1221130233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135681143 (or 135681140 counting only the distinct ones).

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

The square root of 1221130233 is about 34944.6738860159. The cubic root of 1221130233 is about 1068.8595975839.

Adding to 1221130233 its reverse (3320311221), we get a palindrome (4541441454).

The spelling of 1221130233 in words is "one billion, two hundred twenty-one million, one hundred thirty thousand, two hundred thirty-three".