1000221121243 has 2 divisors, whose sum is σ = 1000221121244. Its totient is φ = 1000221121242.

The previous prime is 1000221121189. The next prime is 1000221121261. The reversal of 1000221121243 is 3421211220001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000221121243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000221121243.

It is not a weakly prime, because it can be changed into another prime (1000221121943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500110560621 + 500110560622.

It is an arithmetic number, because the mean of its divisors is an integer number (500110560622).

Almost surely, 2^{1000221121243} is an apocalyptic number.

1000221121243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000221121243 is an equidigital number, since it uses as much as digits as its factorization.

1000221121243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1000221121243 its reverse (3421211220001), we get a palindrome (4421432341244).

The spelling of 1000221121243 in words is "one trillion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred forty-three".