21541619152 has 20 divisors (see below), whose sum is σ = 42041540196. Its totient is φ = 10692189440.

The previous prime is 21541619123. The next prime is 21541619153. The reversal of 21541619152 is 25191614512.

It can be written as a sum of positive squares in 2 ways, for example, as 13056261696 + 8485357456 = 114264^2 + 92116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541619153) 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, 4911499 + ... + 4915882.

Almost surely, 2^21541619152 is an apocalyptic number.

It is an amenable number.

21541619152 is a deficient number, since it is larger than the sum of its proper divisors (20499921044).

21541619152 is a wasteful number, since it uses less digits than its factorization.

21541619152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9827526 (or 9827520 counting only the distinct ones).

The product of its digits is 21600, while the sum is 37.

The spelling of 21541619152 in words is "twenty-one billion, five hundred forty-one million, six hundred nineteen thousand, one hundred fifty-two".