21296481 has 8 divisors (see below), whose sum is σ = 29055840. Its totient is φ = 13867392.

The previous prime is 21296477. The next prime is 21296489. The reversal of 21296481 is 18469212.

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

It is not a de Polignac number, because 21296481 - 2² = 21296477 is a prime.

It is a super-2 number, since 2×21296481² = 907080205966722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21296489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82416 + ... + 82673.

It is an arithmetic number, because the mean of its divisors is an integer number (3631980).

Almost surely, 2^21296481 is an apocalyptic number.

It is an amenable number.

21296481 is a deficient number, since it is larger than the sum of its proper divisors (7759359).

21296481 is a wasteful number, since it uses less digits than its factorization.

21296481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165135.

The product of its digits is 6912, while the sum is 33.

The square root of 21296481 is about 4614.8110470527. The cubic root of 21296481 is about 277.1847178139.

The spelling of 21296481 in words is "twenty-one million, two hundred ninety-six thousand, four hundred eighty-one".