21250469 has 16 divisors (see below), whose sum is σ = 22880256. Its totient is φ = 19699200.

The previous prime is 21250451. The next prime is 21250477. The reversal of 21250469 is 96405212.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21250469 is a prime.

It is a super-2 number, since 2×21250469² = 903164865439922, 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 (21250429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111164 + ... + 111354.

It is an arithmetic number, because the mean of its divisors is an integer number (1430016).

Almost surely, 2^21250469 is an apocalyptic number.

It is an amenable number.

21250469 is a deficient number, since it is larger than the sum of its proper divisors (1629787).

21250469 is a wasteful number, since it uses less digits than its factorization.

21250469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21250469 is about 4609.8230985581. The cubic root of 21250469 is about 276.9849505480.

The spelling of 21250469 in words is "twenty-one million, two hundred fifty thousand, four hundred sixty-nine".