21055041 has 24 divisors (see below), whose sum is σ = 35006400. Its totient is φ = 11945376.

The previous prime is 21055037. The next prime is 21055043. The reversal of 21055041 is 14055012.

It is not a de Polignac number, because 21055041 - 2² = 21055037 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21055043) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8266 + ... + 10508.

It is an arithmetic number, because the mean of its divisors is an integer number (1458600).

Almost surely, 2^21055041 is an apocalyptic number.

21055041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21055041 is a deficient number, since it is larger than the sum of its proper divisors (13951359).

21055041 is a wasteful number, since it uses less digits than its factorization.

21055041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2405 (or 2402 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21055041 is about 4588.5772304713. The cubic root of 21055041 is about 276.1332453662.

The spelling of 21055041 in words is "twenty-one million, fifty-five thousand, forty-one".