21430322 has 4 divisors (see below), whose sum is σ = 32145486. Its totient is φ = 10715160.

The previous prime is 21430301. The next prime is 21430327. The reversal of 21430322 is 22303412.

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

It can be written as a sum of positive squares in only one way, i.e., 21169201 + 261121 = 4601^2 + 511^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21430322.

It is not an unprimeable number, because it can be changed into a prime (21430327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5357579 + ... + 5357582.

Almost surely, 2^21430322 is an apocalyptic number.

21430322 is a deficient number, since it is larger than the sum of its proper divisors (10715164).

21430322 is a wasteful number, since it uses less digits than its factorization.

21430322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715163.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21430322 is about 4629.2895783262. The cubic root of 21430322 is about 277.7641755591.

Adding to 21430322 its reverse (22303412), we get a palindrome (43733734).

The spelling of 21430322 in words is "twenty-one million, four hundred thirty thousand, three hundred twenty-two".