21541013242 has 48 divisors (see below), whose sum is σ = 39478451328. Its totient is φ = 8633214720.

The previous prime is 21541013231. The next prime is 21541013261. The reversal of 21541013242 is 24231014512.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 618267 + ... + 652177.

It is an arithmetic number, because the mean of its divisors is an integer number (822467736).

Almost surely, 2^21541013242 is an apocalyptic number.

21541013242 is a deficient number, since it is larger than the sum of its proper divisors (17937438086).

21541013242 is a wasteful number, since it uses less digits than its factorization.

21541013242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34111 (or 34094 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21541013242 its reverse (24231014512), we get a palindrome (45772027754).

The spelling of 21541013242 in words is "twenty-one billion, five hundred forty-one million, thirteen thousand, two hundred forty-two".