21118524634 has 8 divisors (see below), whose sum is σ = 32111729460. Its totient is φ = 10414614816.

The previous prime is 21118524631. The next prime is 21118524641. The reversal of 21118524634 is 43642581112.

It can be written as a sum of positive squares in 2 ways, for example, as 19853655409 + 1264869225 = 140903^2 + 35565^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21118524593 and 21118524602.

It is not an unprimeable number, because it can be changed into a prime (21118524631) 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, 72323569 + ... + 72323860.

Almost surely, 2^21118524634 is an apocalyptic number.

21118524634 is a deficient number, since it is larger than the sum of its proper divisors (10993204826).

21118524634 is a wasteful number, since it uses less digits than its factorization.

21118524634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144647504.

The product of its digits is 46080, while the sum is 37.

The spelling of 21118524634 in words is "twenty-one billion, one hundred eighteen million, five hundred twenty-four thousand, six hundred thirty-four".