21222099893 has 2 divisors, whose sum is σ = 21222099894. Its totient is φ = 21222099892.

The previous prime is 21222099869. The next prime is 21222099907. The reversal of 21222099893 is 39899022212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20996589604 + 225510289 = 144902^2 + 15017^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222099893 - 2⁸ = 21222099637 is a prime.

It is a super-2 number, since 2×21222099893² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222095893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611049946 + 10611049947.

It is an arithmetic number, because the mean of its divisors is an integer number (10611049947).

Almost surely, 2^21222099893 is an apocalyptic number.

It is an amenable number.

21222099893 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222099893 is an equidigital number, since it uses as much as digits as its factorization.

21222099893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 21222099893 in words is "twenty-one billion, two hundred twenty-two million, ninety-nine thousand, eight hundred ninety-three".