21201031113 has 4 divisors (see below), whose sum is σ = 28268041488. Its totient is φ = 14134020740.

The previous prime is 21201031069. The next prime is 21201031129. The reversal of 21201031113 is 31113010212.

It is a happy number.

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 21201031113 - 2¹² = 21201027017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201031092 and 21201031101.

It is not an unprimeable number, because it can be changed into a prime (21201030113) 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, 3533505183 + ... + 3533505188.

It is an arithmetic number, because the mean of its divisors is an integer number (7067010372).

Almost surely, 2^21201031113 is an apocalyptic number.

It is an amenable number.

21201031113 is a deficient number, since it is larger than the sum of its proper divisors (7067010375).

21201031113 is an equidigital number, since it uses as much as digits as its factorization.

21201031113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067010374.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21201031113 its reverse (31113010212), we get a palindrome (52314041325).

The spelling of 21201031113 in words is "twenty-one billion, two hundred one million, thirty-one thousand, one hundred thirteen".