21160353451646 has 32 divisors (see below), whose sum is σ = 32195813895840. Its totient is φ = 10428602494464.

The previous prime is 21160353451639. The next prime is 21160353451669. The reversal of 21160353451646 is 64615435306112.

It is a self number, because there is not a number n which added to its sum of digits gives 21160353451646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2647356626 + ... + 2647364618.

It is an arithmetic number, because the mean of its divisors is an integer number (1006119184245).

Almost surely, 2^{21160353451646} is an apocalyptic number.

21160353451646 is a deficient number, since it is larger than the sum of its proper divisors (11035460444194).

21160353451646 is a wasteful number, since it uses less digits than its factorization.

21160353451646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17340.

The product of its (nonzero) digits is 1555200, while the sum is 47.

Adding to 21160353451646 its reverse (64615435306112), we get a palindrome (85775788757758).

The spelling of 21160353451646 in words is "twenty-one trillion, one hundred sixty billion, three hundred fifty-three million, four hundred fifty-one thousand, six hundred forty-six".