16206220231 has 4 divisors (see below), whose sum is σ = 16206502032. Its totient is φ = 16205938432.

The previous prime is 16206220213. The next prime is 16206220243. The reversal of 16206220231 is 13202260261.

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

It is a cyclic number.

It is not a de Polignac number, because 16206220231 - 2⁹ = 16206219719 is a prime.

It is a super-2 number, since 2×16206220231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16206220196 and 16206220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16206220211) 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, 20131 + ... + 181156.

It is an arithmetic number, because the mean of its divisors is an integer number (4051625508).

Almost surely, 2^16206220231 is an apocalyptic number.

16206220231 is a deficient number, since it is larger than the sum of its proper divisors (281801).

16206220231 is an equidigital number, since it uses as much as digits as its factorization.

16206220231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281800.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 16206220231 its reverse (13202260261), we get a palindrome (29408480492).

The spelling of 16206220231 in words is "sixteen billion, two hundred six million, two hundred twenty thousand, two hundred thirty-one".