21825766546 has 8 divisors (see below), whose sum is σ = 32739301260. Its totient is φ = 10912666128.

The previous prime is 21825766481. The next prime is 21825766559. The reversal of 21825766546 is 64566752812.

It can be written as a sum of positive squares in 2 ways, for example, as 21810859225 + 14907321 = 147685^2 + 3861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21825766493 and 21825766502.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88900 + ... + 227056.

Almost surely, 2^21825766546 is an apocalyptic number.

21825766546 is a deficient number, since it is larger than the sum of its proper divisors (10913534714).

21825766546 is a wasteful number, since it uses less digits than its factorization.

21825766546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217148.

The product of its digits is 4838400, while the sum is 52.

The spelling of 21825766546 in words is "twenty-one billion, eight hundred twenty-five million, seven hundred sixty-six thousand, five hundred forty-six".