21530255510 has 8 divisors (see below), whose sum is σ = 38754459936. Its totient is φ = 8612102200.

The previous prime is 21530255497. The next prime is 21530255533. The reversal of 21530255510 is 1555203512.

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

It is a congruent number.

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, 1076512766 + ... + 1076512785.

It is an arithmetic number, because the mean of its divisors is an integer number (4844307492).

Almost surely, 2^21530255510 is an apocalyptic number.

21530255510 is a deficient number, since it is larger than the sum of its proper divisors (17224204426).

21530255510 is a wasteful number, since it uses less digits than its factorization.

21530255510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153025558.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 21530255510 in words is "twenty-one billion, five hundred thirty million, two hundred fifty-five thousand, five hundred ten".