21530690510 has 16 divisors (see below), whose sum is σ = 44291706336. Its totient is φ = 7381951008.

The previous prime is 21530690509. The next prime is 21530690543. The reversal of 21530690510 is 1509603512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153790577 + ... + 153790716.

It is an arithmetic number, because the mean of its divisors is an integer number (2768231646).

Almost surely, 2^21530690510 is an apocalyptic number.

21530690510 is an abundant number, since it is smaller than the sum of its proper divisors (22761015826).

21530690510 is a wasteful number, since it uses less digits than its factorization.

21530690510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307581307.

The product of its (nonzero) digits is 8100, while the sum is 32.

The spelling of 21530690510 in words is "twenty-one billion, five hundred thirty million, six hundred ninety thousand, five hundred ten".