2161210042 has 8 divisors (see below), whose sum is σ = 3382763616. Its totient is φ = 1033622172.

The previous prime is 2161210013. The next prime is 2161210049. The reversal of 2161210042 is 2400121612.

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

It is not an unprimeable number, because it can be changed into a prime (2161210049) 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, 23491368 + ... + 23491459.

It is an arithmetic number, because the mean of its divisors is an integer number (422845452).

Almost surely, 2^2161210042 is an apocalyptic number.

2161210042 is a deficient number, since it is larger than the sum of its proper divisors (1221553574).

2161210042 is a wasteful number, since it uses less digits than its factorization.

2161210042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46982852.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2161210042 is about 46488.8163110226. The cubic root of 2161210042 is about 1292.9021538157.

Adding to 2161210042 its reverse (2400121612), we get a palindrome (4561331654).

The spelling of 2161210042 in words is "two billion, one hundred sixty-one million, two hundred ten thousand, forty-two".