2151812880 has 240 divisors, whose sum is σ = 8451780480. Its totient is φ = 480356352.

The previous prime is 2151812851. The next prime is 2151812903. The reversal of 2151812880 is 882181512.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 211756 + ... + 221684.

It is an arithmetic number, because the mean of its divisors is an integer number (35215752).

Almost surely, 2^2151812880 is an apocalyptic number.

2151812880 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 2151812880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4225890240).

2151812880 is an abundant number, since it is smaller than the sum of its proper divisors (6299967600).

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

2151812880 is a wasteful number, since it uses less digits than its factorization.

2151812880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9998 (or 9989 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The square root of 2151812880 is about 46387.6371461190. The cubic root of 2151812880 is about 1291.0255410750.

The spelling of 2151812880 in words is "two billion, one hundred fifty-one million, eight hundred twelve thousand, eight hundred eighty".