21759266619 has 12 divisors (see below), whose sum is σ = 32279513136. Its totient is φ = 14114118672.

The previous prime is 21759266563. The next prime is 21759266719. The reversal of 21759266619 is 91666295712.

It is not a de Polignac number, because 21759266619 - 2⁷ = 21759266491 is a prime.

It is a super-2 number, since 2×21759266619² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21759266119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32671239 + ... + 32671904.

It is an arithmetic number, because the mean of its divisors is an integer number (2689959428).

Almost surely, 2^21759266619 is an apocalyptic number.

21759266619 is a deficient number, since it is larger than the sum of its proper divisors (10520246517).

21759266619 is a wasteful number, since it uses less digits than its factorization.

21759266619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65343186 (or 65343183 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The spelling of 21759266619 in words is "twenty-one billion, seven hundred fifty-nine million, two hundred sixty-six thousand, six hundred nineteen".