2111212304520 has 256 divisors, whose sum is σ = 7343697254400. Its totient is φ = 480163645440.

The previous prime is 2111212304503. The next prime is 2111212304543. The reversal of 2111212304520 is 254032121112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2174604 + ... + 2991876.

It is an arithmetic number, because the mean of its divisors is an integer number (28686317400).

Almost surely, 2^{2111212304520} is an apocalyptic number.

2111212304520 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 2111212304520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3671848627200).

2111212304520 is an abundant number, since it is smaller than the sum of its proper divisors (5232484949880).

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

2111212304520 is a wasteful number, since it uses less digits than its factorization.

2111212304520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817420 (or 817416 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 2111212304520 its reverse (254032121112), we get a palindrome (2365244425632).

The spelling of 2111212304520 in words is "two trillion, one hundred eleven billion, two hundred twelve million, three hundred four thousand, five hundred twenty".