21301330 has 8 divisors (see below), whose sum is σ = 38342412. Its totient is φ = 8520528.

The previous prime is 21301321. The next prime is 21301331. The reversal of 21301330 is 3310312.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 168921 = 4597^2 + 411^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21301330.

It is not an unprimeable number, because it can be changed into a prime (21301331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065057 + ... + 1065076.

Almost surely, 2^21301330 is an apocalyptic number.

21301330 is a deficient number, since it is larger than the sum of its proper divisors (17041082).

21301330 is a wasteful number, since it uses less digits than its factorization.

21301330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2130140.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21301330 is about 4615.3363907737. The cubic root of 21301330 is about 277.2057536319.

Adding to 21301330 its reverse (3310312), we get a palindrome (24611642).

The spelling of 21301330 in words is "twenty-one million, three hundred one thousand, three hundred thirty".