2154012140 has 48 divisors (see below), whose sum is σ = 5441721600. Its totient is φ = 699648192.

The previous prime is 2154012139. The next prime is 2154012163. The reversal of 2154012140 is 412104512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 402230 + ... + 407549.

It is an arithmetic number, because the mean of its divisors is an integer number (113369200).

Almost surely, 2^2154012140 is an apocalyptic number.

2154012140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154012140 is an abundant number, since it is smaller than the sum of its proper divisors (3287709460).

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

2154012140 is a wasteful number, since it uses less digits than its factorization.

2154012140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809814 (or 809812 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2154012140 is about 46411.3363306854. The cubic root of 2154012140 is about 1291.4652221310.

Adding to 2154012140 its reverse (412104512), we get a palindrome (2566116652).

The spelling of 2154012140 in words is "two billion, one hundred fifty-four million, twelve thousand, one hundred forty".