21112522541 has 16 divisors (see below), whose sum is σ = 23266239360. Its totient is φ = 18998046720.

The previous prime is 21112522531. The next prime is 21112522567. The reversal of 21112522541 is 14522521112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21112522541 - 2³⁴ = 3932653357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112522541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112522511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4675901 + ... + 4680413.

It is an arithmetic number, because the mean of its divisors is an integer number (1454139960).

Almost surely, 2^21112522541 is an apocalyptic number.

It is an amenable number.

21112522541 is a deficient number, since it is larger than the sum of its proper divisors (2153716819).

21112522541 is a wasteful number, since it uses less digits than its factorization.

21112522541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8756.

The product of its digits is 1600, while the sum is 26.

The spelling of 21112522541 in words is "twenty-one billion, one hundred twelve million, five hundred twenty-two thousand, five hundred forty-one".