2175421940 has 12 divisors (see below), whose sum is σ = 4568386116. Its totient is φ = 870168768.

The previous prime is 2175421939. The next prime is 2175421943. The reversal of 2175421940 is 491245712.

It can be written as a sum of positive squares in 2 ways, for example, as 1726236304 + 449185636 = 41548^2 + 21194^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2175421940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2175421943) 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, 54385529 + ... + 54385568.

It is an arithmetic number, because the mean of its divisors is an integer number (380698843).

Almost surely, 2^2175421940 is an apocalyptic number.

2175421940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2175421940 is an abundant number, since it is smaller than the sum of its proper divisors (2392964176).

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

2175421940 is a wasteful number, since it uses less digits than its factorization.

2175421940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108771106 (or 108771104 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 2175421940 is about 46641.4187177020. The cubic root of 2175421940 is about 1295.7299621868.

The spelling of 2175421940 in words is "two billion, one hundred seventy-five million, four hundred twenty-one thousand, nine hundred forty".