21828186061 has 4 divisors (see below), whose sum is σ = 23812566624. Its totient is φ = 19843805500.

The previous prime is 21828186047. The next prime is 21828186071. The reversal of 21828186061 is 16068182812.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21828186061 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21828185999 and 21828186017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828186011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 992190265 + ... + 992190286.

It is an arithmetic number, because the mean of its divisors is an integer number (5953141656).

Almost surely, 2^21828186061 is an apocalyptic number.

It is an amenable number.

21828186061 is a deficient number, since it is larger than the sum of its proper divisors (1984380563).

21828186061 is a wasteful number, since it uses less digits than its factorization.

21828186061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984380562.

The product of its (nonzero) digits is 73728, while the sum is 43.

The spelling of 21828186061 in words is "twenty-one billion, eight hundred twenty-eight million, one hundred eighty-six thousand, sixty-one".