21226357013 has 2 divisors, whose sum is σ = 21226357014. Its totient is φ = 21226357012.

The previous prime is 21226356967. The next prime is 21226357039. The reversal of 21226357013 is 31075362212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20753859844 + 472497169 = 144062^2 + 21737^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226357013 - 2²⁰ = 21225308437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226357043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613178506 + 10613178507.

It is an arithmetic number, because the mean of its divisors is an integer number (10613178507).

Almost surely, 2^21226357013 is an apocalyptic number.

It is an amenable number.

21226357013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226357013 is an equidigital number, since it uses as much as digits as its factorization.

21226357013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 21226357013 in words is "twenty-one billion, two hundred twenty-six million, three hundred fifty-seven thousand, thirteen".