21663144136612 has 24 divisors (see below), whose sum is σ = 42783011933760. Its totient is φ = 9507335984160.

The previous prime is 21663144136597. The next prime is 21663144136631.

21663144136612 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8488691568 + ... + 8488694119.

It is an arithmetic number, because the mean of its divisors is an integer number (1782625497240).

Almost surely, 2^{21663144136612} is an apocalyptic number.

21663144136612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21663144136612 is a deficient number, since it is larger than the sum of its proper divisors (21119867797148).

21663144136612 is a wasteful number, since it uses less digits than its factorization.

21663144136612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16977385731 (or 16977385729 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

The spelling of 21663144136612 in words is "twenty-one trillion, six hundred sixty-three billion, one hundred forty-four million, one hundred thirty-six thousand, six hundred twelve".