21869026 has 8 divisors (see below), whose sum is σ = 33566544. Its totient is φ = 10680180.

The previous prime is 21869011. The next prime is 21869027. The reversal of 21869026 is 62096812.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21868982 and 21869000.

It is not an unprimeable number, because it can be changed into a prime (21869027) 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 3 ways as a sum of consecutive naturals, for example, 127060 + ... + 127231.

It is an arithmetic number, because the mean of its divisors is an integer number (4195818).

Almost surely, 2^21869026 is an apocalyptic number.

21869026 is a deficient number, since it is larger than the sum of its proper divisors (11697518).

21869026 is a wasteful number, since it uses less digits than its factorization.

21869026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254336.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 21869026 is about 4676.4330423946. The cubic root of 21869026 is about 279.6467739729.

The spelling of 21869026 in words is "twenty-one million, eight hundred sixty-nine thousand, twenty-six".