21051566045 has 8 divisors (see below), whose sum is σ = 25313754624. Its totient is φ = 16806669264.

The previous prime is 21051566033. The next prime is 21051566051. The reversal of 21051566045 is 54066515012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21051566045 - 2⁶ = 21051565981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21051565996 and 21051566014.

It is a congruent number.

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, 4320269 + ... + 4325138.

It is an arithmetic number, because the mean of its divisors is an integer number (3164219328).

Almost surely, 2^21051566045 is an apocalyptic number.

It is an amenable number.

21051566045 is a deficient number, since it is larger than the sum of its proper divisors (4262188579).

21051566045 is an equidigital number, since it uses as much as digits as its factorization.

21051566045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645899.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 21051566045 in words is "twenty-one billion, fifty-one million, five hundred sixty-six thousand, forty-five".