21417469 has 4 divisors (see below), whose sum is σ = 21554044. Its totient is φ = 21280896.

The previous prime is 21417463. The next prime is 21417481. The reversal of 21417469 is 96471412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15705369 + 5712100 = 3963^2 + 2390^2 .

It is a cyclic number.

It is not a de Polignac number, because 21417469 - 2⁵ = 21417437 is a prime.

It is a super-2 number, since 2×21417469² = 917415956731922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417463) 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, 68052 + ... + 68365.

It is an arithmetic number, because the mean of its divisors is an integer number (5388511).

Almost surely, 2^21417469 is an apocalyptic number.

It is an amenable number.

21417469 is a deficient number, since it is larger than the sum of its proper divisors (136575).

21417469 is a wasteful number, since it uses less digits than its factorization.

21417469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136574.

The product of its digits is 12096, while the sum is 34.

The square root of 21417469 is about 4627.9011441473. The cubic root of 21417469 is about 277.7086340555.

The spelling of 21417469 in words is "twenty-one million, four hundred seventeen thousand, four hundred sixty-nine".