2181142043154 has 24 divisors (see below), whose sum is σ = 4805906199120. Its totient is φ = 714724510968.

The previous prime is 2181142043153. The next prime is 2181142043173. The reversal of 2181142043154 is 4513402411812.

2181142043154 is a `hidden beast` number, since 2 + 1 + 81 + 1 + 420 + 4 + 3 + 154 = 666.

It is a super-2 number, since 2×2181142043154² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2181142043153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1026901972 + ... + 1026904095.

It is an arithmetic number, because the mean of its divisors is an integer number (200246091630).

Almost surely, 2^{2181142043154} is an apocalyptic number.

2181142043154 is an abundant number, since it is smaller than the sum of its proper divisors (2624764155966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2181142043154 is a wasteful number, since it uses less digits than its factorization.

2181142043154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053806134 (or 2053806131 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

Adding to 2181142043154 its reverse (4513402411812), we get a palindrome (6694544454966).

The spelling of 2181142043154 in words is "two trillion, one hundred eighty-one billion, one hundred forty-two million, forty-three thousand, one hundred fifty-four".