21041288 has 16 divisors (see below), whose sum is σ = 40122000. Its totient is φ = 10342096.

The previous prime is 21041263. The next prime is 21041299. The reversal of 21041288 is 88214012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21818 + ... + 22761.

It is an arithmetic number, because the mean of its divisors is an integer number (2507625).

Almost surely, 2^21041288 is an apocalyptic number.

It is an amenable number.

21041288 is a deficient number, since it is larger than the sum of its proper divisors (19080712).

21041288 is a wasteful number, since it uses less digits than its factorization.

21041288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44644 (or 44640 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 21041288 is about 4587.0783729952. The cubic root of 21041288 is about 276.0731095268.

The spelling of 21041288 in words is "twenty-one million, forty-one thousand, two hundred eighty-eight".