21314550 has 24 divisors (see below), whose sum is σ = 52860456. Its totient is φ = 5683840.

The previous prime is 21314543. The next prime is 21314551. The reversal of 21314550 is 5541312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21314551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70899 + ... + 71198.

It is an arithmetic number, because the mean of its divisors is an integer number (2202519).

Almost surely, 2^21314550 is an apocalyptic number.

21314550 is an abundant number, since it is smaller than the sum of its proper divisors (31545906).

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

21314550 is a wasteful number, since it uses less digits than its factorization.

21314550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142112 (or 142107 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21314550 is about 4616.7683502641. The cubic root of 21314550 is about 277.2630881146.

Adding to 21314550 its reverse (5541312), we get a palindrome (26855862).

The spelling of 21314550 in words is "twenty-one million, three hundred fourteen thousand, five hundred fifty".