21222199993 has 2 divisors, whose sum is σ = 21222199994. Its totient is φ = 21222199992.

The previous prime is 21222199963. The next prime is 21222200009. The reversal of 21222199993 is 39999122212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20402408569 + 819791424 = 142837^2 + 28632^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222199993 - 2¹³ = 21222191801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21222199903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611099996 + 10611099997.

It is an arithmetic number, because the mean of its divisors is an integer number (10611099997).

Almost surely, 2^21222199993 is an apocalyptic number.

It is an amenable number.

21222199993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222199993 is an equidigital number, since it uses as much as digits as its factorization.

21222199993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 49.

The spelling of 21222199993 in words is "twenty-one billion, two hundred twenty-two million, one hundred ninety-nine thousand, nine hundred ninety-three".