21220101022243 has 2 divisors, whose sum is σ = 21220101022244. Its totient is φ = 21220101022242.

The previous prime is 21220101022187. The next prime is 21220101022249. The reversal of 21220101022243 is 34222010102212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220101022243 is a prime.

It is not a weakly prime, because it can be changed into another prime (21220101022249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610050511121 + 10610050511122.

It is an arithmetic number, because the mean of its divisors is an integer number (10610050511122).

Almost surely, 2^{21220101022243} is an apocalyptic number.

21220101022243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220101022243 is an equidigital number, since it uses as much as digits as its factorization.

21220101022243 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21220101022243 its reverse (34222010102212), we get a palindrome (55442111124455).

The spelling of 21220101022243 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, twenty-two thousand, two hundred forty-three".