21430411 has 4 divisors (see below), whose sum is σ = 22362192. Its totient is φ = 20498632.

The previous prime is 21430403. The next prime is 21430433. The reversal of 21430411 is 11403412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21430411 - 2³ = 21430403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21430481) 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, 465856 + ... + 465901.

It is an arithmetic number, because the mean of its divisors is an integer number (5590548).

Almost surely, 2^21430411 is an apocalyptic number.

21430411 is a deficient number, since it is larger than the sum of its proper divisors (931781).

21430411 is an equidigital number, since it uses as much as digits as its factorization.

21430411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931780.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21430411 is about 4629.2991910223. The cubic root of 21430411 is about 277.7645600762.

Adding to 21430411 its reverse (11403412), we get a palindrome (32833823).

It can be divided in two parts, 214 and 30411, that added together give a square (30625 = 175²).

The spelling of 21430411 in words is "twenty-one million, four hundred thirty thousand, four hundred eleven".