1221301231 has 2 divisors, whose sum is σ = 1221301232. Its totient is φ = 1221301230.

The previous prime is 1221301223. The next prime is 1221301241. The reversal of 1221301231 is 1321031221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221301231 - 2³ = 1221301223 is a prime.

It is a super-2 number, since 2×1221301231² = 2983153393684230722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221301241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610650615 + 610650616.

It is an arithmetic number, because the mean of its divisors is an integer number (610650616).

Almost surely, 2^1221301231 is an apocalyptic number.

1221301231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221301231 is an equidigital number, since it uses as much as digits as its factorization.

1221301231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1221301231 is about 34947.1204965445. The cubic root of 1221301231 is about 1068.9094869726.

Adding to 1221301231 its reverse (1321031221), we get a palindrome (2542332452).

The spelling of 1221301231 in words is "one billion, two hundred twenty-one million, three hundred one thousand, two hundred thirty-one".