21123296 has 12 divisors (see below), whose sum is σ = 41586552. Its totient is φ = 10561632.

The previous prime is 21123293. The next prime is 21123301. The reversal of 21123296 is 69232112.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330020 + ... + 330083.

It is an arithmetic number, because the mean of its divisors is an integer number (3465546).

Almost surely, 2^21123296 is an apocalyptic number.

It is an amenable number.

21123296 is a deficient number, since it is larger than the sum of its proper divisors (20463256).

21123296 is an equidigital number, since it uses as much as digits as its factorization.

21123296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660113 (or 660105 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 21123296 is about 4596.0087032120. The cubic root of 21123296 is about 276.4313077170.

The spelling of 21123296 in words is "twenty-one million, one hundred twenty-three thousand, two hundred ninety-six".