21727335745 has 16 divisors (see below), whose sum is σ = 26142912000. Its totient is φ = 17335180800.

The previous prime is 21727335739. The next prime is 21727335761. The reversal of 21727335745 is 54753372712.

It is not a de Polignac number, because 21727335745 - 2³ = 21727335737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21727335695 and 21727335704.

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, 6462865 + ... + 6466225.

It is an arithmetic number, because the mean of its divisors is an integer number (1633932000).

Almost surely, 2^21727335745 is an apocalyptic number.

It is an amenable number.

21727335745 is a deficient number, since it is larger than the sum of its proper divisors (4415576255).

21727335745 is a wasteful number, since it uses less digits than its factorization.

21727335745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6456.

The product of its digits is 1234800, while the sum is 46.

The spelling of 21727335745 in words is "twenty-one billion, seven hundred twenty-seven million, three hundred thirty-five thousand, seven hundred forty-five".