1221430113 has 24 divisors (see below), whose sum is σ = 1780702560. Its totient is φ = 806736960.

The previous prime is 1221430081. The next prime is 1221430153. The reversal of 1221430113 is 3110341221.

1221430113 is a `hidden beast` number, since 1 + 221 + 430 + 1 + 13 = 666.

It is not a de Polignac number, because 1221430113 - 2⁵ = 1221430081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221430153) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 951370 + ... + 952652.

It is an arithmetic number, because the mean of its divisors is an integer number (74195940).

Almost surely, 2^1221430113 is an apocalyptic number.

It is an amenable number.

1221430113 is a deficient number, since it is larger than the sum of its proper divisors (559272447).

1221430113 is a wasteful number, since it uses less digits than its factorization.

1221430113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189 (or 2186 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1221430113 is about 34948.9644052581. The cubic root of 1221430113 is about 1068.9470857630.

Adding to 1221430113 its reverse (3110341221), we get a palindrome (4331771334).

The spelling of 1221430113 in words is "one billion, two hundred twenty-one million, four hundred thirty thousand, one hundred thirteen".