21461307 has 16 divisors (see below), whose sum is σ = 32777472. Its totient is φ = 12235680.

The previous prime is 21461287. The next prime is 21461329. The reversal of 21461307 is 70316412.

It is not a de Polignac number, because 21461307 - 2⁷ = 21461179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21461357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11457 + ... + 13197.

It is an arithmetic number, because the mean of its divisors is an integer number (2048592).

Almost surely, 2^21461307 is an apocalyptic number.

21461307 is a deficient number, since it is larger than the sum of its proper divisors (11316165).

21461307 is a wasteful number, since it uses less digits than its factorization.

21461307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21461307 is about 4632.6349953347. The cubic root of 21461307 is about 277.8979794033.

Adding to 21461307 its reverse (70316412), we get a palindrome (91777719).

The spelling of 21461307 in words is "twenty-one million, four hundred sixty-one thousand, three hundred seven".