21226357065 has 8 divisors (see below), whose sum is σ = 33962171328. Its totient is φ = 11320723760.

The previous prime is 21226357057. The next prime is 21226357067. The reversal of 21226357065 is 56075362212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21226357065 - 2³ = 21226357057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21226357067) 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 in 7 ways as a sum of consecutive naturals, for example, 707545221 + ... + 707545250.

It is an arithmetic number, because the mean of its divisors is an integer number (4245271416).

Almost surely, 2^21226357065 is an apocalyptic number.

It is an amenable number.

21226357065 is a deficient number, since it is larger than the sum of its proper divisors (12735814263).

21226357065 is a wasteful number, since it uses less digits than its factorization.

21226357065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415090479.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21226357065 in words is "twenty-one billion, two hundred twenty-six million, three hundred fifty-seven thousand, sixty-five".