21296461 has 8 divisors (see below), whose sum is σ = 22637880. Its totient is φ = 19964928.

The previous prime is 21296453. The next prime is 21296467. The reversal of 21296461 is 16469212.

It can be written as a sum of positive squares in 4 ways, for example, as 81225 + 21215236 = 285^2 + 4606^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21296461 - 2³ = 21296453 is a prime.

It is a super-2 number, since 2×21296461² = 907078502249042, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21296467) by changing a digit.

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, 2245 + ... + 6901.

It is an arithmetic number, because the mean of its divisors is an integer number (2829735).

Almost surely, 2^21296461 is an apocalyptic number.

It is an amenable number.

21296461 is a deficient number, since it is larger than the sum of its proper divisors (1341419).

21296461 is a wasteful number, since it uses less digits than its factorization.

21296461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4943.

The product of its digits is 5184, while the sum is 31.

The square root of 21296461 is about 4614.8088801163. The cubic root of 21296461 is about 277.1846310437.

The spelling of 21296461 in words is "twenty-one million, two hundred ninety-six thousand, four hundred sixty-one".