21642482 has 16 divisors (see below), whose sum is σ = 34516800. Its totient is φ = 10148400.

The previous prime is 21642461. The next prime is 21642487. The reversal of 21642482 is 28424612.

It is not an unprimeable number, because it can be changed into a prime (21642487) 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, 1019 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (2157300).

Almost surely, 2^21642482 is an apocalyptic number.

21642482 is a deficient number, since it is larger than the sum of its proper divisors (12874318).

21642482 is a wasteful number, since it uses less digits than its factorization.

21642482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5761.

The product of its digits is 6144, while the sum is 29.

The square root of 21642482 is about 4652.1481059829. The cubic root of 21642482 is about 278.6777882082.

The spelling of 21642482 in words is "twenty-one million, six hundred forty-two thousand, four hundred eighty-two".