1221222100243 has 2 divisors, whose sum is σ = 1221222100244. Its totient is φ = 1221222100242.

The previous prime is 1221222100093. The next prime is 1221222100297. The reversal of 1221222100243 is 3420012221221.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221222100243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221222103243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610611050121 + 610611050122.

It is an arithmetic number, because the mean of its divisors is an integer number (610611050122).

Almost surely, 2^{1221222100243} is an apocalyptic number.

1221222100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221222100243 is an equidigital number, since it uses as much as digits as its factorization.

1221222100243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 1221222100243 its reverse (3420012221221), we get a palindrome (4641234321464).

The spelling of 1221222100243 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, one hundred thousand, two hundred forty-three".