21999414 has 16 divisors (see below), whose sum is σ = 44411328. Its totient is φ = 7264392.

The previous prime is 21999409. The next prime is 21999427. The reversal of 21999414 is 41499912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16492 + ... + 17775.

It is an arithmetic number, because the mean of its divisors is an integer number (2775708).

Almost surely, 2^21999414 is an apocalyptic number.

21999414 is an abundant number, since it is smaller than the sum of its proper divisors (22411914).

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

21999414 is a wasteful number, since it uses less digits than its factorization.

21999414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34379.

The product of its digits is 23328, while the sum is 39.

The square root of 21999414 is about 4690.3532915976. The cubic root of 21999414 is about 280.2014451722.

The spelling of 21999414 in words is "twenty-one million, nine hundred ninety-nine thousand, four hundred fourteen".