21552107287 has 4 divisors (see below), whose sum is σ = 21552870160. Its totient is φ = 21551344416.

The previous prime is 21552107267. The next prime is 21552107321. The reversal of 21552107287 is 78270125512.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21552107287 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 (21552107207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 337362 + ... + 396127.

It is an arithmetic number, because the mean of its divisors is an integer number (5388217540).

Almost surely, 2^21552107287 is an apocalyptic number.

21552107287 is a deficient number, since it is larger than the sum of its proper divisors (762873).

21552107287 is an equidigital number, since it uses as much as digits as its factorization.

21552107287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762872.

The product of its (nonzero) digits is 78400, while the sum is 40.

The spelling of 21552107287 in words is "twenty-one billion, five hundred fifty-two million, one hundred seven thousand, two hundred eighty-seven".