2171929914 has 144 divisors (see below), whose sum is σ = 6050780736. Its totient is φ = 550851840.

The previous prime is 2171929883. The next prime is 2171929927. The reversal of 2171929914 is 4199291712.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2171929914.

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 71 ways as a sum of consecutive naturals, for example, 653922 + ... + 657234.

Almost surely, 2^2171929914 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171929914, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3025390368).

2171929914 is an abundant number, since it is smaller than the sum of its proper divisors (3878850822).

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

2171929914 is a wasteful number, since it uses less digits than its factorization.

2171929914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3393 (or 3379 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 2171929914 is about 46603.9688653230. The cubic root of 2171929914 is about 1295.0362812890.

The spelling of 2171929914 in words is "two billion, one hundred seventy-one million, nine hundred twenty-nine thousand, nine hundred fourteen".