21366024550 has 96 divisors (see below), whose sum is σ = 43939687680. Its totient is φ = 7679385600.

The previous prime is 21366024527. The next prime is 21366024623. The reversal of 21366024550 is 5542066312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22998486 + ... + 22999414.

It is an arithmetic number, because the mean of its divisors is an integer number (457705080).

Almost surely, 2^21366024550 is an apocalyptic number.

21366024550 is an abundant number, since it is smaller than the sum of its proper divisors (22573663130).

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

21366024550 is a wasteful number, since it uses less digits than its factorization.

21366024550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 1853 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21366024550 in words is "twenty-one billion, three hundred sixty-six million, twenty-four thousand, five hundred fifty".