21291114 has 32 divisors (see below), whose sum is σ = 46388160. Its totient is φ = 6475392.

The previous prime is 21291113. The next prime is 21291119. The reversal of 21291114 is 41119212.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21291113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5409 + ... + 8475.

It is an arithmetic number, because the mean of its divisors is an integer number (1449630).

Almost surely, 2^21291114 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21291114, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23194080).

21291114 is an abundant number, since it is smaller than the sum of its proper divisors (25097046).

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

21291114 is a wasteful number, since it uses less digits than its factorization.

21291114 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3174.

The product of its digits is 144, while the sum is 21.

The square root of 21291114 is about 4614.2295131473. The cubic root of 21291114 is about 277.1614310970.

The spelling of 21291114 in words is "twenty-one million, two hundred ninety-one thousand, one hundred fourteen".