21145330 has 8 divisors (see below), whose sum is σ = 38061612. Its totient is φ = 8458128.

The previous prime is 21145307. The next prime is 21145343. The reversal of 21145330 is 3354112.

It can be written as a sum of positive squares in 2 ways, for example, as 19298449 + 1846881 = 4393^2 + 1359^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21145298 and 21145307.

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, 1057257 + ... + 1057276.

Almost surely, 2^21145330 is an apocalyptic number.

21145330 is a deficient number, since it is larger than the sum of its proper divisors (16916282).

21145330 is a wasteful number, since it uses less digits than its factorization.

21145330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114540.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 21145330 is about 4598.4051583130. The cubic root of 21145330 is about 276.5273907467.

Adding to 21145330 its reverse (3354112), we get a palindrome (24499442).

The spelling of 21145330 in words is "twenty-one million, one hundred forty-five thousand, three hundred thirty".