21103276 has 12 divisors (see below), whose sum is σ = 37090872. Its totient is φ = 10505888.

The previous prime is 21103267. The next prime is 21103301. The reversal of 21103276 is 67230112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10390 + ... + 12253.

It is an arithmetic number, because the mean of its divisors is an integer number (3090906).

Almost surely, 2^21103276 is an apocalyptic number.

It is an amenable number.

21103276 is a deficient number, since it is larger than the sum of its proper divisors (15987596).

21103276 is a wasteful number, since it uses less digits than its factorization.

21103276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22880 (or 22878 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21103276 is about 4593.8302101841. The cubic root of 21103276 is about 276.3439491269.

Adding to 21103276 its reverse (67230112), we get a palindrome (88333388).

The spelling of 21103276 in words is "twenty-one million, one hundred three thousand, two hundred seventy-six".