21296442 has 32 divisors (see below), whose sum is σ = 44711424. Its totient is φ = 6753600.

The previous prime is 21296437. The next prime is 21296449. The reversal of 21296442 is 24469212.

It is not an unprimeable number, because it can be changed into a prime (21296449) 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 15 ways as a sum of consecutive naturals, for example, 10408 + ... + 12284.

It is an arithmetic number, because the mean of its divisors is an integer number (1397232).

Almost surely, 2^21296442 is an apocalyptic number.

21296442 is an abundant number, since it is smaller than the sum of its proper divisors (23414982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21296442 is a wasteful number, since it uses less digits than its factorization.

21296442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974.

The product of its digits is 6912, while the sum is 30.

The square root of 21296442 is about 4614.8068215257. The cubic root of 21296442 is about 277.1845486120.

The spelling of 21296442 in words is "twenty-one million, two hundred ninety-six thousand, four hundred forty-two".