21370469 has 4 divisors (see below), whose sum is σ = 21396096. Its totient is φ = 21344844.

The previous prime is 21370463. The next prime is 21370483. The reversal of 21370469 is 96407312.

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 21370469 - 2²⁰ = 20321893 is a prime.

It is a super-2 number, since 2×21370469² = 913393890559922, 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 (21370463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11519 + ... + 13244.

It is an arithmetic number, because the mean of its divisors is an integer number (5349024).

Almost surely, 2^21370469 is an apocalyptic number.

It is an amenable number.

21370469 is a deficient number, since it is larger than the sum of its proper divisors (25627).

21370469 is an equidigital number, since it uses as much as digits as its factorization.

21370469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25626.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21370469 is about 4622.8204594165. The cubic root of 21370469 is about 277.5053441603.

The spelling of 21370469 in words is "twenty-one million, three hundred seventy thousand, four hundred sixty-nine".