21118525042 has 8 divisors (see below), whose sum is σ = 33345039600. Its totient is φ = 10003511844.

The previous prime is 21118524967. The next prime is 21118525049. The reversal of 21118525042 is 24052581112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21118525042² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21118524995 and 21118525013.

It is not an unprimeable number, because it can be changed into a prime (21118525049) 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, 277875292 + ... + 277875367.

It is an arithmetic number, because the mean of its divisors is an integer number (4168129950).

Almost surely, 2^21118525042 is an apocalyptic number.

21118525042 is a deficient number, since it is larger than the sum of its proper divisors (12226514558).

21118525042 is a wasteful number, since it uses less digits than its factorization.

21118525042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555750680.

The product of its (nonzero) digits is 6400, while the sum is 31.

The spelling of 21118525042 in words is "twenty-one billion, one hundred eighteen million, five hundred twenty-five thousand, forty-two".