1230136221 has 4 divisors (see below), whose sum is σ = 1640181632. Its totient is φ = 820090812.

The previous prime is 1230136207. The next prime is 1230136231. The reversal of 1230136221 is 1226310321.

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 not a de Polignac number, because 1230136221 - 2⁶ = 1230136157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1230136231) 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, 205022701 + ... + 205022706.

It is an arithmetic number, because the mean of its divisors is an integer number (410045408).

Almost surely, 2^1230136221 is an apocalyptic number.

It is an amenable number.

1230136221 is a deficient number, since it is larger than the sum of its proper divisors (410045411).

1230136221 is an equidigital number, since it uses as much as digits as its factorization.

1230136221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410045410.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1230136221 is about 35073.2978346776. The cubic root of 1230136221 is about 1071.4808218354.

Adding to 1230136221 its reverse (1226310321), we get a palindrome (2456446542).

The spelling of 1230136221 in words is "one billion, two hundred thirty million, one hundred thirty-six thousand, two hundred twenty-one".