21869726 has 4 divisors (see below), whose sum is σ = 32804592. Its totient is φ = 10934862.

The previous prime is 21869719. The next prime is 21869747. The reversal of 21869726 is 62796812.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5467430 + ... + 5467433.

It is an arithmetic number, because the mean of its divisors is an integer number (8201148).

Almost surely, 2^21869726 is an apocalyptic number.

21869726 is a deficient number, since it is larger than the sum of its proper divisors (10934866).

21869726 is a wasteful number, since it uses less digits than its factorization.

21869726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10934865.

The product of its digits is 72576, while the sum is 41.

The square root of 21869726 is about 4676.5078851639. The cubic root of 21869726 is about 279.6497576548.

The spelling of 21869726 in words is "twenty-one million, eight hundred sixty-nine thousand, seven hundred twenty-six".