21862538 has 16 divisors (see below), whose sum is σ = 33259200. Its totient is φ = 10777536.

The previous prime is 21862537. The next prime is 21862541. The reversal of 21862538 is 83526812.

It is a junction number, because it is equal to n+sod(n) for n = 21862498 and 21862507.

It is not an unprimeable number, because it can be changed into a prime (21862531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64706 + ... + 65042.

It is an arithmetic number, because the mean of its divisors is an integer number (2078700).

Almost surely, 2^21862538 is an apocalyptic number.

21862538 is a deficient number, since it is larger than the sum of its proper divisors (11396662).

21862538 is a wasteful number, since it uses less digits than its factorization.

21862538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its digits is 23040, while the sum is 35.

The square root of 21862538 is about 4675.7392998327. The cubic root of 21862538 is about 279.6191164735.

The spelling of 21862538 in words is "twenty-one million, eight hundred sixty-two thousand, five hundred thirty-eight".