21202243344131 has 4 divisors (see below), whose sum is σ = 21210907933152. Its totient is φ = 21193578755112.

The previous prime is 21202243344109. The next prime is 21202243344169. The reversal of 21202243344131 is 13144334220212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202243344131 is a prime.

It is a super-2 number, since 2×21202243344131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21202243341131) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4332290840 + ... + 4332295733.

It is an arithmetic number, because the mean of its divisors is an integer number (5302726983288).

Almost surely, 2^{21202243344131} is an apocalyptic number.

21202243344131 is a deficient number, since it is larger than the sum of its proper divisors (8664589021).

21202243344131 is an equidigital number, since it uses as much as digits as its factorization.

21202243344131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8664589020.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 21202243344131 its reverse (13144334220212), we get a palindrome (34346577564343).

The spelling of 21202243344131 in words is "twenty-one trillion, two hundred two billion, two hundred forty-three million, three hundred forty-four thousand, one hundred thirty-one".