2145420043161 has 32 divisors (see below), whose sum is σ = 2925044490240. Its totient is φ = 1398308404800.

The previous prime is 2145420043141. The next prime is 2145420043171. The reversal of 2145420043161 is 1613400245412.

It is a happy number.

It is not a de Polignac number, because 2145420043161 - 2⁶ = 2145420043097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145420043111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197528871 + ... + 197539731.

It is an arithmetic number, because the mean of its divisors is an integer number (91407640320).

Almost surely, 2^{2145420043161} is an apocalyptic number.

It is an amenable number.

2145420043161 is a deficient number, since it is larger than the sum of its proper divisors (779624447079).

2145420043161 is a wasteful number, since it uses less digits than its factorization.

2145420043161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16957.

The product of its (nonzero) digits is 23040, while the sum is 33.

Adding to 2145420043161 its reverse (1613400245412), we get a palindrome (3758820288573).

The spelling of 2145420043161 in words is "two trillion, one hundred forty-five billion, four hundred twenty million, forty-three thousand, one hundred sixty-one".