21056614530 has 512 divisors, whose sum is σ = 66567536640. Its totient is φ = 4154250240.

The previous prime is 21056614529. The next prime is 21056614531. The reversal of 21056614530 is 3541665012.

It is an interprime number because it is at equal distance from previous prime (21056614529) and next prime (21056614531).

It is a junction number, because it is equal to n+sod(n) for n = 21056614491 and 21056614500.

It is not an unprimeable number, because it can be changed into a prime (21056614531) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 196790737 + ... + 196790843.

It is an arithmetic number, because the mean of its divisors is an integer number (130014720).

Almost surely, 2^21056614530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21056614530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33283768320).

21056614530 is an abundant number, since it is smaller than the sum of its proper divisors (45510922110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21056614530 is a wasteful number, since it uses less digits than its factorization.

21056614530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254.

The product of its (nonzero) digits is 21600, while the sum is 33.

The spelling of 21056614530 in words is "twenty-one billion, fifty-six million, six hundred fourteen thousand, five hundred thirty".