2154012220 has 96 divisors (see below), whose sum is σ = 4722157440. Its totient is φ = 824878080.

The previous prime is 2154012199. The next prime is 2154012221. The reversal of 2154012220 is 222104512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154012221) 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, 11900530 + ... + 11900710.

It is an arithmetic number, because the mean of its divisors is an integer number (49189140).

Almost surely, 2^2154012220 is an apocalyptic number.

2154012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2154012220 is an abundant number, since it is smaller than the sum of its proper divisors (2568145220).

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

2154012220 is a wasteful number, since it uses less digits than its factorization.

2154012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 2154012220 is about 46411.3371925438. The cubic root of 2154012220 is about 1291.4652381193.

Adding to 2154012220 its reverse (222104512), we get a palindrome (2376116732).

The spelling of 2154012220 in words is "two billion, one hundred fifty-four million, twelve thousand, two hundred twenty".