21430413 has 32 divisors (see below), whose sum is σ = 33062400. Its totient is φ = 13880160.

The previous prime is 21430403. The next prime is 21430433. The reversal of 21430413 is 31403412.

It is not a de Polignac number, because 21430413 - 2⁹ = 21429901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21430403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89548 + ... + 89786.

It is an arithmetic number, because the mean of its divisors is an integer number (1033200).

Almost surely, 2^21430413 is an apocalyptic number.

It is an amenable number.

21430413 is a deficient number, since it is larger than the sum of its proper divisors (11631987).

21430413 is an frugal number, since it uses more digits than its factorization.

21430413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21430413 is about 4629.2994070377. The cubic root of 21430413 is about 277.7645687171.

Adding to 21430413 its reverse (31403412), we get a palindrome (52833825).

The spelling of 21430413 in words is "twenty-one million, four hundred thirty thousand, four hundred thirteen".