21442542520041 has 20 divisors (see below), whose sum is σ = 32032906237332. Its totient is φ = 14294379529728.

The previous prime is 21442542519977. The next prime is 21442542520097. The reversal of 21442542520041 is 14002524524412.

21442542520041 is a `hidden beast` number, since 2 + 1 + 4 + 4 + 25 + 425 + 200 + 4 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 15296585877225 + 6145956642816 = 3911085^2 + 2479104^2 .

It is not a de Polignac number, because 21442542520041 - 2⁶ = 21442542519977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21442542519978 and 21442542520005.

It is not an unprimeable number, because it can be changed into a prime (21442542520241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4208616 + ... + 7784441.

Almost surely, 2^{21442542520041} is an apocalyptic number.

It is an amenable number.

21442542520041 is a deficient number, since it is larger than the sum of its proper divisors (10590363717291).

21442542520041 is a wasteful number, since it uses less digits than its factorization.

21442542520041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12015142 (or 12015133 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 36.

The spelling of 21442542520041 in words is "twenty-one trillion, four hundred forty-two billion, five hundred forty-two million, five hundred twenty thousand, forty-one".