1235340221 has 4 divisors (see below), whose sum is σ = 1239898944. Its totient is φ = 1230781500.

The previous prime is 1235340217. The next prime is 1235340247. The reversal of 1235340221 is 1220435321.

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 a cyclic number.

It is not a de Polignac number, because 1235340221 - 2² = 1235340217 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 (1235340251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278955 + ... + 2279496.

It is an arithmetic number, because the mean of its divisors is an integer number (309974736).

Almost surely, 2^1235340221 is an apocalyptic number.

It is an amenable number.

1235340221 is a deficient number, since it is larger than the sum of its proper divisors (4558723).

1235340221 is an equidigital number, since it uses as much as digits as its factorization.

1235340221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4558722.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1235340221 is about 35147.4070309603. The cubic root of 1235340221 is about 1072.9896362245.

Adding to 1235340221 its reverse (1220435321), we get a palindrome (2455775542).

The spelling of 1235340221 in words is "one billion, two hundred thirty-five million, three hundred forty thousand, two hundred twenty-one".