21255522041 has 16 divisors (see below), whose sum is σ = 23546201280. Its totient is φ = 19066259520.

The previous prime is 21255522037. The next prime is 21255522049. The reversal of 21255522041 is 14022555212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21255522041 - 2² = 21255522037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21255521995 and 21255522013.

It is not an unprimeable number, because it can be changed into a prime (21255522049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95651 + ... + 227288.

It is an arithmetic number, because the mean of its divisors is an integer number (1471637580).

Almost surely, 2^21255522041 is an apocalyptic number.

It is an amenable number.

21255522041 is a deficient number, since it is larger than the sum of its proper divisors (2290679239).

21255522041 is a wasteful number, since it uses less digits than its factorization.

21255522041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323096.

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 21255522041 in words is "twenty-one billion, two hundred fifty-five million, five hundred twenty-two thousand, forty-one".