21794061646 has 16 divisors (see below), whose sum is σ = 37384364160. Its totient is φ = 9334533240.

The previous prime is 21794061599. The next prime is 21794061647. The reversal of 21794061646 is 64616049712.

It is a super-2 number, since 2×21794061646² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21794061596 and 21794061605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21794061647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458100 + ... + 503431.

It is an arithmetic number, because the mean of its divisors is an integer number (2336522760).

Almost surely, 2^21794061646 is an apocalyptic number.

21794061646 is a deficient number, since it is larger than the sum of its proper divisors (15590302514).

21794061646 is a wasteful number, since it uses less digits than its factorization.

21794061646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963159.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 21794061646 in words is "twenty-one billion, seven hundred ninety-four million, sixty-one thousand, six hundred forty-six".