21222401243 has 2 divisors, whose sum is σ = 21222401244. Its totient is φ = 21222401242.

The previous prime is 21222401203. The next prime is 21222401251. The reversal of 21222401243 is 34210422212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222401243 - 2¹⁶ = 21222335707 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222401203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611200621 + 10611200622.

It is an arithmetic number, because the mean of its divisors is an integer number (10611200622).

Almost surely, 2^21222401243 is an apocalyptic number.

21222401243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222401243 is an equidigital number, since it uses as much as digits as its factorization.

21222401243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21222401243 its reverse (34210422212), we get a palindrome (55432823455).

The spelling of 21222401243 in words is "twenty-one billion, two hundred twenty-two million, four hundred one thousand, two hundred forty-three".