21054041 has 8 divisors (see below), whose sum is σ = 22332744. Its totient is φ = 19779840.

The previous prime is 21054037. The next prime is 21054049. The reversal of 21054041 is 14045012.

It can be written as a sum of positive squares in 4 ways, for example, as 1729225 + 19324816 = 1315^2 + 4396^2 .

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

It is not a de Polignac number, because 21054041 - 2² = 21054037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21054049) 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, 16751 + ... + 17963.

It is an arithmetic number, because the mean of its divisors is an integer number (2791593).

Almost surely, 2^21054041 is an apocalyptic number.

It is an amenable number.

21054041 is a deficient number, since it is larger than the sum of its proper divisors (1278703).

21054041 is a wasteful number, since it uses less digits than its factorization.

21054041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2251.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21054041 is about 4588.4682629392. The cubic root of 21054041 is about 276.1288736876.

Adding to 21054041 its reverse (14045012), we get a palindrome (35099053).

The spelling of 21054041 in words is "twenty-one million, fifty-four thousand, forty-one".