21226357039 has 2 divisors, whose sum is σ = 21226357040. Its totient is φ = 21226357038.

The previous prime is 21226357013. The next prime is 21226357043. The reversal of 21226357039 is 93075362212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21226357039 - 2⁹ = 21226356527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21226356992 and 21226357010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226357079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613178519 + 10613178520.

It is an arithmetic number, because the mean of its divisors is an integer number (10613178520).

Almost surely, 2^21226357039 is an apocalyptic number.

21226357039 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226357039 is an equidigital number, since it uses as much as digits as its factorization.

21226357039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The spelling of 21226357039 in words is "twenty-one billion, two hundred twenty-six million, three hundred fifty-seven thousand, thirty-nine".