21411013 has 4 divisors (see below), whose sum is σ = 23058028. Its totient is φ = 19764000.

The previous prime is 21411011. The next prime is 21411017. The reversal of 21411013 is 31011412.

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 5673924 + 15737089 = 2382^2 + 3967^2 .

It is a cyclic number.

It is not a de Polignac number, because 21411013 - 2¹ = 21411011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 1647001 = 21411013 / (2 + 1 + 4 + 1 + 1 + 0 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21410984 and 21411002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411011) 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, 823488 + ... + 823513.

It is an arithmetic number, because the mean of its divisors is an integer number (5764507).

Almost surely, 2^21411013 is an apocalyptic number.

It is an amenable number.

21411013 is a deficient number, since it is larger than the sum of its proper divisors (1647015).

21411013 is a wasteful number, since it uses less digits than its factorization.

21411013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647014.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21411013 is about 4627.2035831591. The cubic root of 21411013 is about 277.6807274416.

Adding to 21411013 its reverse (31011412), we get a palindrome (52422425).

The spelling of 21411013 in words is "twenty-one million, four hundred eleven thousand, thirteen".