21240655498 has 8 divisors (see below), whose sum is σ = 31891829508. Its totient is φ = 10610045664.

The previous prime is 21240655481. The next prime is 21240655511. The reversal of 21240655498 is 89455604212.

It can be written as a sum of positive squares in 2 ways, for example, as 19747837729 + 1492817769 = 140527^2 + 38637^2 .

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, 5138461 + ... + 5142592.

Almost surely, 2^21240655498 is an apocalyptic number.

21240655498 is a deficient number, since it is larger than the sum of its proper divisors (10651174010).

21240655498 is a wasteful number, since it uses less digits than its factorization.

21240655498 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10282088.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 21240655498 in words is "twenty-one billion, two hundred forty million, six hundred fifty-five thousand, four hundred ninety-eight".