21410917 has 4 divisors (see below), whose sum is σ = 23357376. Its totient is φ = 19464460.

The previous prime is 21410911. The next prime is 21410933. The reversal of 21410917 is 71901412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21410917 - 2⁷ = 21410789 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21410891 and 21410900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 973213 + ... + 973234.

It is an arithmetic number, because the mean of its divisors is an integer number (5839344).

Almost surely, 2^21410917 is an apocalyptic number.

It is an amenable number.

21410917 is a deficient number, since it is larger than the sum of its proper divisors (1946459).

21410917 is a wasteful number, since it uses less digits than its factorization.

21410917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1946458.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 21410917 is about 4627.1932097115. The cubic root of 21410917 is about 277.6803124310.

The spelling of 21410917 in words is "twenty-one million, four hundred ten thousand, nine hundred seventeen".