21052545514 has 96 divisors (see below), whose sum is σ = 43379280000. Its totient is φ = 7532300160.

The previous prime is 21052545511. The next prime is 21052545533. The reversal of 21052545514 is 41554525012.

It is a self number, because there is not a number n which added to its sum of digits gives 21052545514.

It is not an unprimeable number, because it can be changed into a prime (21052545511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2785012 + ... + 2792560.

It is an arithmetic number, because the mean of its divisors is an integer number (451867500).

Almost surely, 2^21052545514 is an apocalyptic number.

21052545514 is an abundant number, since it is smaller than the sum of its proper divisors (22326734486).

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

21052545514 is a wasteful number, since it uses less digits than its factorization.

21052545514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7788 (or 7781 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 21052545514 in words is "twenty-one billion, fifty-two million, five hundred forty-five thousand, five hundred fourteen".