21646773267 has 48 divisors (see below), whose sum is σ = 34034827680. Its totient is φ = 12200896512.

The previous prime is 21646773263. The next prime is 21646773287. The reversal of 21646773267 is 76237764612.

It is not a de Polignac number, because 21646773267 - 2² = 21646773263 is a prime.

It is a super-5 number, since 5×21646773267⁵ (a number of 53 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (21646773263) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4517709 + ... + 4522497.

It is an arithmetic number, because the mean of its divisors is an integer number (709058910).

Almost surely, 2^21646773267 is an apocalyptic number.

21646773267 is a deficient number, since it is larger than the sum of its proper divisors (12388054413).

21646773267 is a wasteful number, since it uses less digits than its factorization.

21646773267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220 (or 5213 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 51.

The spelling of 21646773267 in words is "twenty-one billion, six hundred forty-six million, seven hundred seventy-three thousand, two hundred sixty-seven".