21045348 has 18 divisors (see below), whose sum is σ = 53198054. Its totient is φ = 7015104.

The previous prime is 21045319. The next prime is 21045377. The reversal of 21045348 is 84354012.

It is an interprime number because it is at equal distance from previous prime (21045319) and next prime (21045377).

It can be written as a sum of positive squares in only one way, i.e., 11009124 + 10036224 = 3318^2 + 3168^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×21045348² = 885813344882208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292261 + ... + 292332.

Almost surely, 2^21045348 is an apocalyptic number.

It is an amenable number.

21045348 is an abundant number, since it is smaller than the sum of its proper divisors (32152706).

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

21045348 is a wasteful number, since it uses less digits than its factorization.

21045348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584603 (or 584598 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 21045348 is about 4587.5208991350. The cubic root of 21045348 is about 276.0908648522.

The spelling of 21045348 in words is "twenty-one million, forty-five thousand, three hundred forty-eight".