21064552887 has 16 divisors (see below), whose sum is σ = 32538072320. Its totient is φ = 11871997632.

The previous prime is 21064552877. The next prime is 21064552913. The reversal of 21064552887 is 78825546012.

It is not a de Polignac number, because 21064552887 - 2⁶ = 21064552823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064552807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6868837 + ... + 6871902.

It is an arithmetic number, because the mean of its divisors is an integer number (2033629520).

Almost surely, 2^21064552887 is an apocalyptic number.

21064552887 is a deficient number, since it is larger than the sum of its proper divisors (11473519433).

21064552887 is a wasteful number, since it uses less digits than its factorization.

21064552887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13740822.

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 21064552887 in words is "twenty-one billion, sixty-four million, five hundred fifty-two thousand, eight hundred eighty-seven".