21110131201 has 4 divisors (see below), whose sum is σ = 21114094932. Its totient is φ = 21106167472.

The previous prime is 21110131187. The next prime is 21110131223. The reversal of 21110131201 is 10213101112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17206880625 + 3903250576 = 131175^2 + 62476^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110131201 - 2⁷ = 21110131073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21110131901) 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, 1973866 + ... + 1984531.

It is an arithmetic number, because the mean of its divisors is an integer number (5278523733).

Almost surely, 2^21110131201 is an apocalyptic number.

It is an amenable number.

21110131201 is a deficient number, since it is larger than the sum of its proper divisors (3963731).

21110131201 is an equidigital number, since it uses as much as digits as its factorization.

21110131201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963730.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21110131201 its reverse (10213101112), we get a palindrome (31323232313).

The spelling of 21110131201 in words is "twenty-one billion, one hundred ten million, one hundred thirty-one thousand, two hundred one".