21227762017 has 56 divisors (see below), whose sum is σ = 27671011200. Its totient is φ = 16142787360.

The previous prime is 21227761999. The next prime is 21227762021. The reversal of 21227762017 is 71026772212.

It is not a de Polignac number, because 21227762017 - 2¹⁵ = 21227729249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21227762057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 60824359 + ... + 60824707.

It is an arithmetic number, because the mean of its divisors is an integer number (494125200).

Almost surely, 2^21227762017 is an apocalyptic number.

It is an amenable number.

21227762017 is a deficient number, since it is larger than the sum of its proper divisors (6443249183).

21227762017 is an frugal number, since it uses more digits than its factorization.

21227762017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 37.

The spelling of 21227762017 in words is "twenty-one billion, two hundred twenty-seven million, seven hundred sixty-two thousand, seventeen".