21303430 has 8 divisors (see below), whose sum is σ = 38346192. Its totient is φ = 8521368.

The previous prime is 21303421. The next prime is 21303467. The reversal of 21303430 is 3430312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21303430² = 907672259529800, which contains 22 as substring.

It is a congruent number.

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, 1065162 + ... + 1065181.

It is an arithmetic number, because the mean of its divisors is an integer number (4793274).

Almost surely, 2^21303430 is an apocalyptic number.

21303430 is a deficient number, since it is larger than the sum of its proper divisors (17042762).

21303430 is a wasteful number, since it uses less digits than its factorization.

21303430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130350.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21303430 is about 4615.5638875440. The cubic root of 21303430 is about 277.2148628120.

Adding to 21303430 its reverse (3430312), we get a palindrome (24733742).

The spelling of 21303430 in words is "twenty-one million, three hundred three thousand, four hundred thirty".