21513014002221 has 16 divisors (see below), whose sum is σ = 32785315880064. Its totient is φ = 12291808261824.

The previous prime is 21513014002211. The next prime is 21513014002237. The reversal of 21513014002221 is 12220041031512.

It is a happy number.

It is not a de Polignac number, because 21513014002221 - 2²² = 21513009807917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21513014002191 and 21513014002200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21513014002211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55744650 + ... + 56129243.

It is an arithmetic number, because the mean of its divisors is an integer number (2049082242504).

Almost surely, 2^{21513014002221} is an apocalyptic number.

21513014002221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21513014002221 is a deficient number, since it is larger than the sum of its proper divisors (11272301877843).

21513014002221 is a wasteful number, since it uses less digits than its factorization.

21513014002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111883060.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21513014002221 its reverse (12220041031512), we get a palindrome (33733055033733).

The spelling of 21513014002221 in words is "twenty-one trillion, five hundred thirteen billion, fourteen million, two thousand, two hundred twenty-one".