21839276 has 6 divisors (see below), whose sum is σ = 38218740. Its totient is φ = 10919636.

The previous prime is 21839273. The next prime is 21839297. The reversal of 21839276 is 67293812.

It is not an unprimeable number, because it can be changed into a prime (21839273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2729906 + ... + 2729913.

It is an arithmetic number, because the mean of its divisors is an integer number (6369790).

Almost surely, 2^21839276 is an apocalyptic number.

It is an amenable number.

21839276 is a deficient number, since it is larger than the sum of its proper divisors (16379464).

21839276 is a wasteful number, since it uses less digits than its factorization.

21839276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459823 (or 5459821 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 21839276 is about 4673.2511167281. The cubic root of 21839276 is about 279.5199085924.

The spelling of 21839276 in words is "twenty-one million, eight hundred thirty-nine thousand, two hundred seventy-six".