21243524474 has 8 divisors (see below), whose sum is σ = 32249206080. Its totient is φ = 10493789116.

The previous prime is 21243524459. The next prime is 21243524509. The reversal of 21243524474 is 47442534212.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63986354 + ... + 63986685.

It is an arithmetic number, because the mean of its divisors is an integer number (4031150760).

Almost surely, 2^21243524474 is an apocalyptic number.

21243524474 is a deficient number, since it is larger than the sum of its proper divisors (11005681606).

21243524474 is a wasteful number, since it uses less digits than its factorization.

21243524474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127973124.

The product of its digits is 215040, while the sum is 38.

The spelling of 21243524474 in words is "twenty-one billion, two hundred forty-three million, five hundred twenty-four thousand, four hundred seventy-four".