21461330 has 16 divisors (see below), whose sum is σ = 42142464. Its totient is φ = 7804080.

The previous prime is 21461329. The next prime is 21461357. The reversal of 21461330 is 3316412.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97442 + ... + 97661.

It is an arithmetic number, because the mean of its divisors is an integer number (2633904).

Almost surely, 2^21461330 is an apocalyptic number.

21461330 is a deficient number, since it is larger than the sum of its proper divisors (20681134).

21461330 is a wasteful number, since it uses less digits than its factorization.

21461330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195121.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 21461330 is about 4632.6374777226. The cubic root of 21461330 is about 277.8980786774.

Adding to 21461330 its reverse (3316412), we get a palindrome (24777742).

The spelling of 21461330 in words is "twenty-one million, four hundred sixty-one thousand, three hundred thirty".