21564242064140 has 48 divisors (see below), whose sum is σ = 45301827299904. Its totient is φ = 8622474854400.

The previous prime is 21564242064121. The next prime is 21564242064187. The reversal of 21564242064140 is 4146024246512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689576705 + ... + 689607975.

It is an arithmetic number, because the mean of its divisors is an integer number (943788068748).

Almost surely, 2^{21564242064140} is an apocalyptic number.

21564242064140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21564242064140 is an abundant number, since it is smaller than the sum of its proper divisors (23737585235764).

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

21564242064140 is a wasteful number, since it uses less digits than its factorization.

21564242064140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43058 (or 43056 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 41.

The spelling of 21564242064140 in words is "twenty-one trillion, five hundred sixty-four billion, two hundred forty-two million, sixty-four thousand, one hundred forty".