1221354133231 has 2 divisors, whose sum is σ = 1221354133232. Its totient is φ = 1221354133230.

The previous prime is 1221354133229. The next prime is 1221354133247. The reversal of 1221354133231 is 1323314531221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221354133231 - 2¹ = 1221354133229 is a prime.

It is a super-2 number, since 2×1221354133231² (a number of 25 digits) contains 22 as substring.

Together with 1221354133229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1221354133193 and 1221354133202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221354133331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610677066615 + 610677066616.

It is an arithmetic number, because the mean of its divisors is an integer number (610677066616).

Almost surely, 2^{1221354133231} is an apocalyptic number.

1221354133231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221354133231 is an equidigital number, since it uses as much as digits as its factorization.

1221354133231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

Adding to 1221354133231 its reverse (1323314531221), we get a palindrome (2544668664452).

The spelling of 1221354133231 in words is "one trillion, two hundred twenty-one billion, three hundred fifty-four million, one hundred thirty-three thousand, two hundred thirty-one".