21023041 has 8 divisors (see below), whose sum is σ = 22685544. Its totient is φ = 19367040.

The previous prime is 21023017. The next prime is 21023047. The reversal of 21023041 is 14032012.

It can be written as a sum of positive squares in 4 ways, for example, as 92416 + 20930625 = 304^2 + 4575^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21023041 - 2⁷ = 21022913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6711 + ... + 9331.

It is an arithmetic number, because the mean of its divisors is an integer number (2835693).

Almost surely, 2^21023041 is an apocalyptic number.

It is an amenable number.

21023041 is a deficient number, since it is larger than the sum of its proper divisors (1662503).

21023041 is a wasteful number, since it uses less digits than its factorization.

21023041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3251.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21023041 is about 4585.0889849598. The cubic root of 21023041 is about 275.9932829353.

Adding to 21023041 its reverse (14032012), we get a palindrome (35055053).

The spelling of 21023041 in words is "twenty-one million, twenty-three thousand, forty-one".