21041401 has 4 divisors (see below), whose sum is σ = 21386404. Its totient is φ = 20696400.

The previous prime is 21041387. The next prime is 21041407. The reversal of 21041401 is 10414012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5517801 + 15523600 = 2349^2 + 3940^2 .

It is a cyclic number.

It is not a de Polignac number, because 21041401 - 2⁵ = 21041369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21041407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172410 + ... + 172531.

It is an arithmetic number, because the mean of its divisors is an integer number (5346601).

Almost surely, 2^21041401 is an apocalyptic number.

It is an amenable number.

21041401 is a deficient number, since it is larger than the sum of its proper divisors (345003).

21041401 is an equidigital number, since it uses as much as digits as its factorization.

21041401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345002.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21041401 is about 4587.0906901870. The cubic root of 21041401 is about 276.0736037330.

Adding to 21041401 its reverse (10414012), we get a palindrome (31455413).

It can be divided in two parts, 2 and 1041401, that multiplied together give a palindrome (2082802).

The spelling of 21041401 in words is "twenty-one million, forty-one thousand, four hundred one".