21063602560 has 768 divisors, whose sum is σ = 70651728000. Its totient is φ = 5960908800.

The previous prime is 21063602543. The next prime is 21063602611. The reversal of 21063602560 is 6520636012.

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, 345304930 + ... + 345304990.

Almost surely, 2^21063602560 is an apocalyptic number.

21063602560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21063602560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35325864000).

21063602560 is an abundant number, since it is smaller than the sum of its proper divisors (49588125440).

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

21063602560 is a wasteful number, since it uses less digits than its factorization.

21063602560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 21063602560 in words is "twenty-one billion, sixty-three million, six hundred two thousand, five hundred sixty".