21430212 has 12 divisors (see below), whose sum is σ = 50003856. Its totient is φ = 7143400.

The previous prime is 21430193. The next prime is 21430229. The reversal of 21430212 is 21203412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21430191 and 21430200.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892914 + ... + 892937.

It is an arithmetic number, because the mean of its divisors is an integer number (4166988).

Almost surely, 2^21430212 is an apocalyptic number.

It is an amenable number.

21430212 is an abundant number, since it is smaller than the sum of its proper divisors (28573644).

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

21430212 is a wasteful number, since it uses less digits than its factorization.

21430212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785858 (or 1785856 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21430212 is about 4629.2776974383. The cubic root of 21430212 is about 277.7637003118.

Adding to 21430212 its reverse (21203412), we get a palindrome (42633624).

The spelling of 21430212 in words is "twenty-one million, four hundred thirty thousand, two hundred twelve".