21865034 has 8 divisors (see below), whose sum is σ = 32828868. Its totient is φ = 10922080.

The previous prime is 21865007. The next prime is 21865037. The reversal of 21865034 is 43056812.

It can be written as a sum of positive squares in 2 ways, for example, as 21855625 + 9409 = 4675^2 + 97^2 .

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

It is a super-3 number, since 3×21865034³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21864988 and 21865006.

It is not an unprimeable number, because it can be changed into a prime (21865037) 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 3 ways as a sum of consecutive naturals, for example, 2267 + ... + 6990.

Almost surely, 2^21865034 is an apocalyptic number.

21865034 is a deficient number, since it is larger than the sum of its proper divisors (10963834).

21865034 is a wasteful number, since it uses less digits than its factorization.

21865034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21865034 is about 4676.0062018778. The cubic root of 21865034 is about 279.6297572441.

The spelling of 21865034 in words is "twenty-one million, eight hundred sixty-five thousand, thirty-four".