16221143772131 has 4 divisors (see below), whose sum is σ = 16272314572992. Its totient is φ = 16169972971272.

The previous prime is 16221143772091. The next prime is 16221143772157. The reversal of 16221143772131 is 13127734112261.

16221143772131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-16221143772131 is a prime.

It is a super-2 number, since 2×16221143772131² (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 (16221143777131) 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, 25585399955 + ... + 25585400588.

It is an arithmetic number, because the mean of its divisors is an integer number (4068078643248).

Almost surely, 2^{16221143772131} is an apocalyptic number.

16221143772131 is a deficient number, since it is larger than the sum of its proper divisors (51170800861).

16221143772131 is an equidigital number, since it uses as much as digits as its factorization.

16221143772131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51170800860.

The product of its digits is 84672, while the sum is 41.

Adding to 16221143772131 its reverse (13127734112261), we get a palindrome (29348877884392).

The spelling of 16221143772131 in words is "sixteen trillion, two hundred twenty-one billion, one hundred forty-three million, seven hundred seventy-two thousand, one hundred thirty-one".