21797228133 has 12 divisors (see below), whose sum is σ = 32853793440. Its totient is φ = 13899681576.

The previous prime is 21797228111. The next prime is 21797228171. The reversal of 21797228133 is 33182279712.

It is not a de Polignac number, because 21797228133 - 2¹² = 21797224037 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21797228333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52650103 + ... + 52650516.

It is an arithmetic number, because the mean of its divisors is an integer number (2737816120).

Almost surely, 2^21797228133 is an apocalyptic number.

21797228133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21797228133 is a deficient number, since it is larger than the sum of its proper divisors (11056565307).

21797228133 is a wasteful number, since it uses less digits than its factorization.

21797228133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105300648 (or 105300645 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The spelling of 21797228133 in words is "twenty-one billion, seven hundred ninety-seven million, two hundred twenty-eight thousand, one hundred thirty-three".