21119550 has 24 divisors (see below), whose sum is σ = 52376856. Its totient is φ = 5631840.

The previous prime is 21119531. The next prime is 21119561. The reversal of 21119550 is 5591112.

It is a self number, because there is not a number n which added to its sum of digits gives 21119550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70249 + ... + 70548.

It is an arithmetic number, because the mean of its divisors is an integer number (2182369).

Almost surely, 2^21119550 is an apocalyptic number.

21119550 is an abundant number, since it is smaller than the sum of its proper divisors (31257306).

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

21119550 is a wasteful number, since it uses less digits than its factorization.

21119550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140812 (or 140807 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 24.

The square root of 21119550 is about 4595.6011576289. The cubic root of 21119550 is about 276.4149659981.

The spelling of 21119550 in words is "twenty-one million, one hundred nineteen thousand, five hundred fifty".