2154122012 has 12 divisors (see below), whose sum is σ = 4308244080. Its totient is φ = 923195136.

The previous prime is 2154122011. The next prime is 2154122077. The reversal of 2154122012 is 2102214512.

2154122012 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154122011) 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, 38466437 + ... + 38466492.

It is an arithmetic number, because the mean of its divisors is an integer number (359020340).

Almost surely, 2^2154122012 is an apocalyptic number.

It is an amenable number.

2154122012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2154122012 is a wasteful number, since it uses less digits than its factorization.

2154122012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76932940 (or 76932938 counting only the distinct ones).

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

The square root of 2154122012 is about 46412.5199919160. The cubic root of 2154122012 is about 1291.4871801401.

Adding to 2154122012 its reverse (2102214512), we get a palindrome (4256336524).

The spelling of 2154122012 in words is "two billion, one hundred fifty-four million, one hundred twenty-two thousand, twelve".