229111871520 has 480 divisors, whose sum is σ = 856000837440. Its totient is φ = 51494123520.

The previous prime is 229111871501. The next prime is 229111871563. The reversal of 229111871520 is 25178111922.

It is a tau number, because it is divible by the number of its divisors (480).

It is a super-2 number, since 2×229111871520² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 70299651 + ... + 70302909.

It is an arithmetic number, because the mean of its divisors is an integer number (1783335078).

Almost surely, 2^229111871520 is an apocalyptic number.

229111871520 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 229111871520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428000418720).

229111871520 is an abundant number, since it is smaller than the sum of its proper divisors (626888965920).

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

229111871520 is an equidigital number, since it uses as much as digits as its factorization.

229111871520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3366 (or 3337 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 39.

It can be divided in two parts, 22911 and 1871520, that added together give a triangular number (1894431 = T₁₉₄₆).

The spelling of 229111871520 in words is "two hundred twenty-nine billion, one hundred eleven million, eight hundred seventy-one thousand, five hundred twenty".