21040413 has 8 divisors (see below), whose sum is σ = 28958976. Its totient is φ = 13574400.

The previous prime is 21040387. The next prime is 21040427. The reversal of 21040413 is 31404012.

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

It is not a de Polignac number, because 21040413 - 2⁸ = 21040157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21040392 and 21040401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040463) 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, 113028 + ... + 113213.

It is an arithmetic number, because the mean of its divisors is an integer number (3619872).

Almost surely, 2^21040413 is an apocalyptic number.

It is an amenable number.

21040413 is a deficient number, since it is larger than the sum of its proper divisors (7918563).

21040413 is a wasteful number, since it uses less digits than its factorization.

21040413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226275.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21040413 is about 4586.9829953903. The cubic root of 21040413 is about 276.0692826489.

Adding to 21040413 its reverse (31404012), we get a palindrome (52444425).

The spelling of 21040413 in words is "twenty-one million, forty thousand, four hundred thirteen".