2151138220 has 192 divisors, whose sum is σ = 5951232000. Its totient is φ = 646705920.

The previous prime is 2151138179. The next prime is 2151138259. The reversal of 2151138220 is 228311512.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2187849 + ... + 2188831.

It is an arithmetic number, because the mean of its divisors is an integer number (30996000).

Almost surely, 2^2151138220 is an apocalyptic number.

2151138220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151138220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2975616000).

2151138220 is an abundant number, since it is smaller than the sum of its proper divisors (3800093780).

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

2151138220 is a wasteful number, since it uses less digits than its factorization.

2151138220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 2151138220 is about 46380.3645953759. The cubic root of 2151138220 is about 1290.8906014706.

Adding to 2151138220 its reverse (228311512), we get a palindrome (2379449732).

The spelling of 2151138220 in words is "two billion, one hundred fifty-one million, one hundred thirty-eight thousand, two hundred twenty".