21226078507 has 2 divisors, whose sum is σ = 21226078508. Its totient is φ = 21226078506.

The previous prime is 21226078499. The next prime is 21226078529. The reversal of 21226078507 is 70587062212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21226078507 - 2³ = 21226078499 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21226078507.

It is not a weakly prime, because it can be changed into another prime (21226078567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613039253 + 10613039254.

It is an arithmetic number, because the mean of its divisors is an integer number (10613039254).

Almost surely, 2^21226078507 is an apocalyptic number.

21226078507 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226078507 is an equidigital number, since it uses as much as digits as its factorization.

21226078507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 21226078507 in words is "twenty-one billion, two hundred twenty-six million, seventy-eight thousand, five hundred seven".