21229594 has 8 divisors (see below), whose sum is σ = 32159988. Its totient is φ = 10509600.

The previous prime is 21229589. The next prime is 21229597. The reversal of 21229594 is 49592212.

It can be written as a sum of positive squares in 2 ways, for example, as 13417569 + 7812025 = 3663^2 + 2795^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21229594² = 901391322809672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21229597) 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, 52347 + ... + 52750.

Almost surely, 2^21229594 is an apocalyptic number.

21229594 is a deficient number, since it is larger than the sum of its proper divisors (10930394).

21229594 is a wasteful number, since it uses less digits than its factorization.

21229594 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105200.

The product of its digits is 12960, while the sum is 34.

The square root of 21229594 is about 4607.5583555719. The cubic root of 21229594 is about 276.8942238417.

The spelling of 21229594 in words is "twenty-one million, two hundred twenty-nine thousand, five hundred ninety-four".