21131214101 has 4 divisors (see below), whose sum is σ = 21135499212. Its totient is φ = 21126928992.

The previous prime is 21131214079. The next prime is 21131214119. The reversal of 21131214101 is 10141213112.

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 10025215876 + 11105998225 = 100126^2 + 105385^2 .

It is a cyclic number.

It is not a de Polignac number, because 21131214101 - 2³⁰ = 20057472277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21131214101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131214161) 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, 2135150 + ... + 2145023.

It is an arithmetic number, because the mean of its divisors is an integer number (5283874803).

Almost surely, 2^21131214101 is an apocalyptic number.

It is an amenable number.

21131214101 is a deficient number, since it is larger than the sum of its proper divisors (4285111).

21131214101 is an equidigital number, since it uses as much as digits as its factorization.

21131214101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4285110.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21131214101 its reverse (10141213112), we get a palindrome (31272427213).

The spelling of 21131214101 in words is "twenty-one billion, one hundred thirty-one million, two hundred fourteen thousand, one hundred one".