2175421938 has 16 divisors (see below), whose sum is σ = 4351837440. Its totient is φ = 724975056.

The previous prime is 2175421883. The next prime is 2175421939. The reversal of 2175421938 is 8391245712.

It is a self number, because there is not a number n which added to its sum of digits gives 2175421938.

It is not an unprimeable number, because it can be changed into a prime (2175421939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11245 + ... + 66912.

It is an arithmetic number, because the mean of its divisors is an integer number (271989840).

Almost surely, 2^2175421938 is an apocalyptic number.

2175421938 is an abundant number, since it is smaller than the sum of its proper divisors (2176415502).

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

2175421938 is a wasteful number, since it uses less digits than its factorization.

2175421938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82801.

The product of its digits is 120960, while the sum is 42.

The square root of 2175421938 is about 46641.4186962618. The cubic root of 2175421938 is about 1295.7299617897.

The spelling of 2175421938 in words is "two billion, one hundred seventy-five million, four hundred twenty-one thousand, nine hundred thirty-eight".