21470430 has 16 divisors (see below), whose sum is σ = 51529104. Its totient is φ = 5725440.

The previous prime is 21470419. The next prime is 21470441. The reversal of 21470430 is 3407412.

It is an interprime number because it is at equal distance from previous prime (21470419) and next prime (21470441).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21470397 and 21470406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357811 + ... + 357870.

It is an arithmetic number, because the mean of its divisors is an integer number (3220569).

Almost surely, 2^21470430 is an apocalyptic number.

21470430 is an abundant number, since it is smaller than the sum of its proper divisors (30058674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21470430 is a wasteful number, since it uses less digits than its factorization.

21470430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715691.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21470430 is about 4633.6195355251. The cubic root of 21470430 is about 277.9373510985.

Adding to 21470430 its reverse (3407412), we get a palindrome (24877842).

The spelling of 21470430 in words is "twenty-one million, four hundred seventy thousand, four hundred thirty".