21700469 has 4 divisors (see below), whose sum is σ = 24800544. Its totient is φ = 18600396.

The previous prime is 21700409. The next prime is 21700493. The reversal of 21700469 is 96400712.

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 21700469 - 2²⁰ = 20651893 is a prime.

It is a super-2 number, since 2×21700469² = 941820709639922, 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 (21700409) 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, 1550027 + ... + 1550040.

It is an arithmetic number, because the mean of its divisors is an integer number (6200136).

Almost surely, 2^21700469 is an apocalyptic number.

It is an amenable number.

21700469 is a deficient number, since it is larger than the sum of its proper divisors (3100075).

21700469 is an equidigital number, since it uses as much as digits as its factorization.

21700469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3100074.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 21700469 is about 4658.3762192421. The cubic root of 21700469 is about 278.9264546667.

The spelling of 21700469 in words is "twenty-one million, seven hundred thousand, four hundred sixty-nine".