21163316346645 has 16 divisors (see below), whose sum is σ = 36939606714432. Its totient is φ = 10261001864960.

The previous prime is 21163316346593. The next prime is 21163316346703. The reversal of 21163316346645 is 54664361336112.

It is not a de Polignac number, because 21163316346645 - 2¹⁰ = 21163316345621 is a prime.

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, 64131261492 + ... + 64131261821.

It is an arithmetic number, because the mean of its divisors is an integer number (2308725419652).

Almost surely, 2^{21163316346645} is an apocalyptic number.

It is an amenable number.

21163316346645 is a deficient number, since it is larger than the sum of its proper divisors (15776290367787).

21163316346645 is a wasteful number, since it uses less digits than its factorization.

21163316346645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128262523332.

The product of its digits is 5598720, while the sum is 51.

The spelling of 21163316346645 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, three hundred forty-six thousand, six hundred forty-five".