2175421904 has 20 divisors (see below), whose sum is σ = 4245649764. Its totient is φ = 1079770368.

The previous prime is 2175421883. The next prime is 2175421939. The reversal of 2175421904 is 4091245712.

It can be written as a sum of positive squares in 2 ways, for example, as 809971600 + 1365450304 = 28460^2 + 36952^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494027 + ... + 498410.

Almost surely, 2^2175421904 is an apocalyptic number.

It is an amenable number.

2175421904 is a deficient number, since it is larger than the sum of its proper divisors (2070227860).

2175421904 is a wasteful number, since it uses less digits than its factorization.

2175421904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992582 (or 992576 counting only the distinct ones).

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

The square root of 2175421904 is about 46641.4183317789. The cubic root of 2175421904 is about 1295.7299550393.

The spelling of 2175421904 in words is "two billion, one hundred seventy-five million, four hundred twenty-one thousand, nine hundred four".