21120403013 has 4 divisors (see below), whose sum is σ = 21801706368. Its totient is φ = 20439099660.

The previous prime is 21120402949. The next prime is 21120403049. The reversal of 21120403013 is 31030402112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21120403013 - 2⁶ = 21120402949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120402982 and 21120403000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120403093) 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, 340651631 + ... + 340651692.

It is an arithmetic number, because the mean of its divisors is an integer number (5450426592).

Almost surely, 2^21120403013 is an apocalyptic number.

It is an amenable number.

21120403013 is a deficient number, since it is larger than the sum of its proper divisors (681303355).

21120403013 is an equidigital number, since it uses as much as digits as its factorization.

21120403013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681303354.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21120403013 its reverse (31030402112), we get a palindrome (52150805125).

Subtracting 21120403013 from its reverse (31030402112), we obtain a palindrome (9909999099).

The spelling of 21120403013 in words is "twenty-one billion, one hundred twenty million, four hundred three thousand, thirteen".