21023268 has 48 divisors (see below), whose sum is σ = 56300160. Its totient is φ = 5981184.

The previous prime is 21023267. The next prime is 21023269. The reversal of 21023268 is 86232012.

It is an interprime number because it is at equal distance from previous prime (21023267) and next prime (21023269).

It is not an unprimeable number, because it can be changed into a prime (21023263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29298 + ... + 30006.

It is an arithmetic number, because the mean of its divisors is an integer number (1172920).

Almost surely, 2^21023268 is an apocalyptic number.

21023268 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21023268 is an abundant number, since it is smaller than the sum of its proper divisors (35276892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21023268 is a wasteful number, since it uses less digits than its factorization.

21023268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076 (or 1074 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21023268 is about 4585.1137390473. The cubic root of 21023268 is about 275.9942762938.

The spelling of 21023268 in words is "twenty-one million, twenty-three thousand, two hundred sixty-eight".