21226357079 has 2 divisors, whose sum is σ = 21226357080. Its totient is φ = 21226357078.

The previous prime is 21226357067. The next prime is 21226357133. The reversal of 21226357079 is 97075362212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21226357079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226357039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613178539 + 10613178540.

It is an arithmetic number, because the mean of its divisors is an integer number (10613178540).

Almost surely, 2^21226357079 is an apocalyptic number.

21226357079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226357079 is an equidigital number, since it uses as much as digits as its factorization.

21226357079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 21226357079 in words is "twenty-one billion, two hundred twenty-six million, three hundred fifty-seven thousand, seventy-nine".