21366317241550 has 96 divisors (see below), whose sum is σ = 42840564885504. Its totient is φ = 7905019056000.

The previous prime is 21366317241517. The next prime is 21366317241671. The reversal of 21366317241550 is 5514271366312.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 21366317241550.

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, 45290385 + ... + 45759715.

It is an arithmetic number, because the mean of its divisors is an integer number (446255884224).

Almost surely, 2^{21366317241550} is an apocalyptic number.

21366317241550 is an abundant number, since it is smaller than the sum of its proper divisors (21474247643954).

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

21366317241550 is a wasteful number, since it uses less digits than its factorization.

21366317241550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470674 (or 470669 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 21366317241550 in words is "twenty-one trillion, three hundred sixty-six billion, three hundred seventeen million, two hundred forty-one thousand, five hundred fifty".