21223153 has 8 divisors (see below), whose sum is σ = 24297408. Its totient is φ = 18159504.

The previous prime is 21223141. The next prime is 21223159. The reversal of 21223153 is 35132212.

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

It is a cyclic number.

It is not a de Polignac number, because 21223153 - 2¹³ = 21214961 is a prime.

It is a super-2 number, since 2×21223153² = 900844446522818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21223153.

It is not an unprimeable number, because it can be changed into a prime (21223159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2250 + ... + 6892.

It is an arithmetic number, because the mean of its divisors is an integer number (3037176).

Almost surely, 2^21223153 is an apocalyptic number.

It is an amenable number.

21223153 is a deficient number, since it is larger than the sum of its proper divisors (3074255).

21223153 is an equidigital number, since it uses as much as digits as its factorization.

21223153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5303.

The product of its digits is 360, while the sum is 19.

The square root of 21223153 is about 4606.8593423286. The cubic root of 21223153 is about 276.8662180291.

Adding to 21223153 its reverse (35132212), we get a palindrome (56355365).

The spelling of 21223153 in words is "twenty-one million, two hundred twenty-three thousand, one hundred fifty-three".