21797079066 has 24 divisors (see below), whose sum is σ = 53973719904. Its totient is φ = 6227736840.

The previous prime is 21797079061. The next prime is 21797079097. The reversal of 21797079066 is 66097079712.

It is a happy number.

It is a super-2 number, since 2×21797079066² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21797079061) 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 11 ways as a sum of consecutive naturals, for example, 86496220 + ... + 86496471.

It is an arithmetic number, because the mean of its divisors is an integer number (2248904996).

Almost surely, 2^21797079066 is an apocalyptic number.

21797079066 is an abundant number, since it is smaller than the sum of its proper divisors (32176640838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21797079066 is a wasteful number, since it uses less digits than its factorization.

21797079066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172992706 (or 172992703 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The spelling of 21797079066 in words is "twenty-one billion, seven hundred ninety-seven million, seventy-nine thousand, sixty-six".