21041090 has 48 divisors (see below), whose sum is σ = 45997632. Its totient is φ = 6896736.

The previous prime is 21041071. The next prime is 21041099. The reversal of 21041090 is 9014012.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21041099) 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, 10337 + ... + 12203.

It is an arithmetic number, because the mean of its divisors is an integer number (958284).

Almost surely, 2^21041090 is an apocalyptic number.

21041090 is an abundant number, since it is smaller than the sum of its proper divisors (24956542).

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

21041090 is a wasteful number, since it uses less digits than its factorization.

21041090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1911 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21041090 is about 4587.0567905793. The cubic root of 21041090 is about 276.0722435683.

The spelling of 21041090 in words is "twenty-one million, forty-one thousand, ninety".