21227166745 has 16 divisors (see below), whose sum is σ = 25574693760. Its totient is φ = 16913808000.

The previous prime is 21227166731. The next prime is 21227166817. The reversal of 21227166745 is 54766172212.

It is not a de Polignac number, because 21227166745 - 2¹¹ = 21227164697 is a prime.

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, 1311150 + ... + 1327240.

It is an arithmetic number, because the mean of its divisors is an integer number (1598418360).

Almost surely, 2^21227166745 is an apocalyptic number.

It is an amenable number.

21227166745 is a deficient number, since it is larger than the sum of its proper divisors (4347527015).

21227166745 is a wasteful number, since it uses less digits than its factorization.

21227166745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17136.

The product of its digits is 282240, while the sum is 43.

The spelling of 21227166745 in words is "twenty-one billion, two hundred twenty-seven million, one hundred sixty-six thousand, seven hundred forty-five".