21265748 has 12 divisors (see below), whose sum is σ = 42531552. Its totient is φ = 9113880.

The previous prime is 21265747. The next prime is 21265771. The reversal of 21265748 is 84756212.

21265748 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 379718 + ... + 379773.

It is an arithmetic number, because the mean of its divisors is an integer number (3544296).

Almost surely, 2^21265748 is an apocalyptic number.

21265748 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21265748 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21265748 is a wasteful number, since it uses less digits than its factorization.

21265748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 759502 (or 759500 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 21265748 is about 4611.4800227259. The cubic root of 21265748 is about 277.0513183254.

The spelling of 21265748 in words is "twenty-one million, two hundred sixty-five thousand, seven hundred forty-eight".