21255348 has 24 divisors (see below), whose sum is σ = 50337952. Its totient is φ = 6979104.

The previous prime is 21255329. The next prime is 21255361. The reversal of 21255348 is 84355212.

It is a super-2 number, since 2×21255348² = 903579637202208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12415 + ... + 14022.

Almost surely, 2^21255348 is an apocalyptic number.

It is an amenable number.

21255348 is an abundant number, since it is smaller than the sum of its proper divisors (29082604).

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

21255348 is a wasteful number, since it uses less digits than its factorization.

21255348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26511 (or 26509 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 21255348 is about 4610.3522641985. The cubic root of 21255348 is about 277.0061470396.

The spelling of 21255348 in words is "twenty-one million, two hundred fifty-five thousand, three hundred forty-eight".