2111212520 has 16 divisors (see below), whose sum is σ = 4750228260. Its totient is φ = 844484992.

The previous prime is 2111212483. The next prime is 2111212529. The reversal of 2111212520 is 252121112.

It can be written as a sum of positive squares in 2 ways, for example, as 2106993604 + 4218916 = 45902^2 + 2054^2 .

It is not an unprimeable number, because it can be changed into a prime (2111212529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26390117 + ... + 26390196.

Almost surely, 2^2111212520 is an apocalyptic number.

2111212520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2111212520 is an abundant number, since it is smaller than the sum of its proper divisors (2639015740).

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

2111212520 is a wasteful number, since it uses less digits than its factorization.

2111212520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52780324 (or 52780320 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 2111212520 is about 45947.9327064885. The cubic root of 2111212520 is about 1282.8542507401.

Adding to 2111212520 its reverse (252121112), we get a palindrome (2363333632).

The spelling of 2111212520 in words is "two billion, one hundred eleven million, two hundred twelve thousand, five hundred twenty".