21222741679 has 2 divisors, whose sum is σ = 21222741680. Its totient is φ = 21222741678.

The previous prime is 21222741643. The next prime is 21222741703. The reversal of 21222741679 is 97614722212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21222741679 - 2⁹ = 21222741167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222741629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611370839 + 10611370840.

It is an arithmetic number, because the mean of its divisors is an integer number (10611370840).

Almost surely, 2^21222741679 is an apocalyptic number.

21222741679 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222741679 is an equidigital number, since it uses as much as digits as its factorization.

21222741679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 43.

The spelling of 21222741679 in words is "twenty-one billion, two hundred twenty-two million, seven hundred forty-one thousand, six hundred seventy-nine".