1235031221 has 4 divisors (see below), whose sum is σ = 1239054432. Its totient is φ = 1231008012.

The previous prime is 1235031211. The next prime is 1235031223. The reversal of 1235031221 is 1221305321.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221305321 = 373 ⋅3274277.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1235031221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1235031193 and 1235031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1235031223) 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, 2011145 + ... + 2011758.

It is an arithmetic number, because the mean of its divisors is an integer number (309763608).

Almost surely, 2^1235031221 is an apocalyptic number.

It is an amenable number.

1235031221 is a deficient number, since it is larger than the sum of its proper divisors (4023211).

1235031221 is an equidigital number, since it uses as much as digits as its factorization.

1235031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4023210.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1235031221 is about 35143.0109836935. The cubic root of 1235031221 is about 1072.9001652054.

Adding to 1235031221 its reverse (1221305321), we get a palindrome (2456336542).

The spelling of 1235031221 in words is "one billion, two hundred thirty-five million, thirty-one thousand, two hundred twenty-one".