2161206404431 has 8 divisors (see below), whose sum is σ = 2162092720320. Its totient is φ = 2160320218752.

The previous prime is 2161206404353. The next prime is 2161206404459. The reversal of 2161206404431 is 1344046021612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161206404431 - 2⁷ = 2161206404303 is a prime.

It is a super-2 number, since 2×2161206404431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161206404491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45616651 + ... + 45664003.

It is an arithmetic number, because the mean of its divisors is an integer number (270261590040).

Almost surely, 2^{2161206404431} is an apocalyptic number.

2161206404431 is a deficient number, since it is larger than the sum of its proper divisors (886315889).

2161206404431 is a wasteful number, since it uses less digits than its factorization.

2161206404431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65105.

The product of its (nonzero) digits is 27648, while the sum is 34.

The spelling of 2161206404431 in words is "two trillion, one hundred sixty-one billion, two hundred six million, four hundred four thousand, four hundred thirty-one".