2171969520 has 320 divisors, whose sum is σ = 7919493120. Its totient is φ = 482227200.

The previous prime is 2171969483. The next prime is 2171969531. The reversal of 2171969520 is 259691712.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15625611 + ... + 15625749.

It is an arithmetic number, because the mean of its divisors is an integer number (24748416).

Almost surely, 2^2171969520 is an apocalyptic number.

2171969520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2171969520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3959746560).

2171969520 is an abundant number, since it is smaller than the sum of its proper divisors (5747523600).

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

2171969520 is a wasteful number, since it uses less digits than its factorization.

2171969520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 2171969520 is about 46604.3937842775. The cubic root of 2171969520 is about 1295.0441530739.

The spelling of 2171969520 in words is "two billion, one hundred seventy-one million, nine hundred sixty-nine thousand, five hundred twenty".