21066654510 has 192 divisors, whose sum is σ = 63053303040. Its totient is φ = 4826304000.

The previous prime is 21066654457. The next prime is 21066654559. The reversal of 21066654510 is 1545666012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9234570 + ... + 9236850.

It is an arithmetic number, because the mean of its divisors is an integer number (328402620).

Almost surely, 2^21066654510 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21066654510, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31526651520).

21066654510 is an abundant number, since it is smaller than the sum of its proper divisors (41986648530).

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

21066654510 is a wasteful number, since it uses less digits than its factorization.

21066654510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815 (or 2812 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

It can be divided in two parts, 21066 and 654510, that added together give a palindrome (675576).

The spelling of 21066654510 in words is "twenty-one billion, sixty-six million, six hundred fifty-four thousand, five hundred ten".