21201323115 has 16 divisors (see below), whose sum is σ = 38768133888. Its totient is φ = 9692033376.

The previous prime is 21201323083. The next prime is 21201323123. The reversal of 21201323115 is 51132310212.

It is not a de Polignac number, because 21201323115 - 2⁵ = 21201323083 is a prime.

It is a super-2 number, since 2×21201323115² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21201323091 and 21201323100.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100958577 + ... + 100958786.

It is an arithmetic number, because the mean of its divisors is an integer number (2423008368).

Almost surely, 2^21201323115 is an apocalyptic number.

21201323115 is a deficient number, since it is larger than the sum of its proper divisors (17566810773).

21201323115 is a wasteful number, since it uses less digits than its factorization.

21201323115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201917378.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21201323115 its reverse (51132310212), we get a palindrome (72333633327).

The spelling of 21201323115 in words is "twenty-one billion, two hundred one million, three hundred twenty-three thousand, one hundred fifteen".