2181372420 has 48 divisors (see below), whose sum is σ = 6112770048. Its totient is φ = 581230080.

The previous prime is 2181372337. The next prime is 2181372421. The reversal of 2181372420 is 242731812.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (2181372421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63805 + ... + 91835.

It is an arithmetic number, because the mean of its divisors is an integer number (127349376).

Almost surely, 2^2181372420 is an apocalyptic number.

2181372420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2181372420 is an abundant number, since it is smaller than the sum of its proper divisors (3931397628).

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

2181372420 is a wasteful number, since it uses less digits than its factorization.

2181372420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29340 (or 29338 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 2181372420 is about 46705.1648107573. The cubic root of 2181372420 is about 1296.9102996305.

The spelling of 2181372420 in words is "two billion, one hundred eighty-one million, three hundred seventy-two thousand, four hundred twenty".