21905414 has 4 divisors (see below), whose sum is σ = 32858124. Its totient is φ = 10952706.

The previous prime is 21905399. The next prime is 21905441. The reversal of 21905414 is 41450912.

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

It is a super-2 number, since 2×21905414² = 959694325022792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5476352 + ... + 5476355.

It is an arithmetic number, because the mean of its divisors is an integer number (8214531).

Almost surely, 2^21905414 is an apocalyptic number.

21905414 is a deficient number, since it is larger than the sum of its proper divisors (10952710).

21905414 is a wasteful number, since it uses less digits than its factorization.

21905414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10952709.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 21905414 is about 4680.3219974698. The cubic root of 21905414 is about 279.8017899938.

The spelling of 21905414 in words is "twenty-one million, nine hundred five thousand, four hundred fourteen".