21524842918 has 16 divisors (see below), whose sum is σ = 32583812976. Its totient is φ = 10663825120.

The previous prime is 21524842903. The next prime is 21524842919. The reversal of 21524842918 is 81924842512.

It is a happy number.

It is a super-3 number, since 3×21524842918³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21524842919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108180 + ... + 233992.

It is an arithmetic number, because the mean of its divisors is an integer number (2036488311).

Almost surely, 2^21524842918 is an apocalyptic number.

21524842918 is a deficient number, since it is larger than the sum of its proper divisors (11058970058).

21524842918 is a wasteful number, since it uses less digits than its factorization.

21524842918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126599.

The product of its digits is 368640, while the sum is 46.

The spelling of 21524842918 in words is "twenty-one billion, five hundred twenty-four million, eight hundred forty-two thousand, nine hundred eighteen".