21461475 has 24 divisors (see below), whose sum is σ = 40552960. Its totient is φ = 9810720.

The previous prime is 21461467. The next prime is 21461521. The reversal of 21461475 is 57416412.

It is not a de Polignac number, because 21461475 - 2³ = 21461467 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19915 + ... + 20964.

Almost surely, 2^21461475 is an apocalyptic number.

21461475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21461475 is a deficient number, since it is larger than the sum of its proper divisors (19091485).

21461475 is a wasteful number, since it uses less digits than its factorization.

21461475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40899 (or 40894 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The square root of 21461475 is about 4632.6531275285. The cubic root of 21461475 is about 277.8987045337.

Adding to 21461475 its reverse (57416412), we get a palindrome (78877887).

The spelling of 21461475 in words is "twenty-one million, four hundred sixty-one thousand, four hundred seventy-five".