21783058441 has 4 divisors (see below), whose sum is σ = 21808596292. Its totient is φ = 21757520592.

The previous prime is 21783058417. The next prime is 21783058447. The reversal of 21783058441 is 14485038712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12005804041 + 9777254400 = 109571^2 + 98880^2 .

It is a cyclic number.

It is not a de Polignac number, because 21783058441 - 2⁷ = 21783058313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21783058447) 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, 12767646 + ... + 12769351.

It is an arithmetic number, because the mean of its divisors is an integer number (5452149073).

Almost surely, 2^21783058441 is an apocalyptic number.

It is an amenable number.

21783058441 is a deficient number, since it is larger than the sum of its proper divisors (25537851).

21783058441 is an equidigital number, since it uses as much as digits as its factorization.

21783058441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25537850.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 21783058441 in words is "twenty-one billion, seven hundred eighty-three million, fifty-eight thousand, four hundred forty-one".