2013521403 has 8 divisors (see below), whose sum is σ = 2690445888. Its totient is φ = 1339472264.

The previous prime is 2013521401. The next prime is 2013521413. The reversal of 2013521403 is 3041253102.

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 2013521403 - 2¹ = 2013521401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2013521403.

It is not an unprimeable number, because it can be changed into a prime (2013521401) 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, 717201 + ... + 720002.

It is an arithmetic number, because the mean of its divisors is an integer number (336305736).

Almost surely, 2^2013521403 is an apocalyptic number.

2013521403 is a deficient number, since it is larger than the sum of its proper divisors (676924485).

2013521403 is a wasteful number, since it uses less digits than its factorization.

2013521403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437673.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2013521403 is about 44872.2787810024. The cubic root of 2013521403 is about 1262.7539919396.

Adding to 2013521403 its reverse (3041253102), we get a palindrome (5054774505).

The spelling of 2013521403 in words is "two billion, thirteen million, five hundred twenty-one thousand, four hundred three".