21298814 has 4 divisors (see below), whose sum is σ = 31948224. Its totient is φ = 10649406.

The previous prime is 21298799. The next prime is 21298819. The reversal of 21298814 is 41889212.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5324702 + ... + 5324705.

It is an arithmetic number, because the mean of its divisors is an integer number (7987056).

Almost surely, 2^21298814 is an apocalyptic number.

21298814 is a deficient number, since it is larger than the sum of its proper divisors (10649410).

21298814 is a wasteful number, since it uses less digits than its factorization.

21298814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10649409.

The product of its digits is 9216, while the sum is 35.

The square root of 21298814 is about 4615.0638132100. The cubic root of 21298814 is about 277.1948391783.

The spelling of 21298814 in words is "twenty-one million, two hundred ninety-eight thousand, eight hundred fourteen".