21407814 has 28 divisors (see below), whose sum is σ = 48148836. Its totient is φ = 7135452.

The previous prime is 21407809. The next prime is 21407821. The reversal of 21407814 is 41870412.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 5884 + ... + 8799.

Almost surely, 2^21407814 is an apocalyptic number.

21407814 is an abundant number, since it is smaller than the sum of its proper divisors (26741022).

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

21407814 is an equidigital number, since it uses as much as digits as its factorization.

21407814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14703 (or 14688 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21407814 is about 4626.8578971047. The cubic root of 21407814 is about 277.6668974110. Note that the first 3 decimals are identical.

The spelling of 21407814 in words is "twenty-one million, four hundred seven thousand, eight hundred fourteen".