21455348 has 24 divisors (see below), whose sum is σ = 39320064. Its totient is φ = 10231200.

The previous prime is 21455327. The next prime is 21455353. The reversal of 21455348 is 84355412.

It is a super-2 number, since 2×21455348² = 920663915602208, which contains 22 as substring.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7586 + ... + 10022.

It is an arithmetic number, because the mean of its divisors is an integer number (1638336).

Almost surely, 2^21455348 is an apocalyptic number.

It is an amenable number.

21455348 is a deficient number, since it is larger than the sum of its proper divisors (17864716).

21455348 is a wasteful number, since it uses less digits than its factorization.

21455348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543 (or 2541 counting only the distinct ones).

The product of its digits is 19200, while the sum is 32.

The square root of 21455348 is about 4631.9917961931. The cubic root of 21455348 is about 277.8722564072.

The spelling of 21455348 in words is "twenty-one million, four hundred fifty-five thousand, three hundred forty-eight".