2121211125 has 128 divisors (see below), whose sum is σ = 4531438080. Its totient is φ = 967680000.

The previous prime is 2121211111. The next prime is 2121211139. The reversal of 2121211125 is 5211121212.

It is an interprime number because it is at equal distance from previous prime (2121211111) and next prime (2121211139).

It is not a de Polignac number, because 2121211125 - 2⁴ = 2121211109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121211098 and 2121211107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 629445 + ... + 632805.

It is an arithmetic number, because the mean of its divisors is an integer number (35401860).

Almost surely, 2^2121211125 is an apocalyptic number.

2121211125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121211125 is an abundant number, since it is smaller than the sum of its proper divisors (2410226955).

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

2121211125 is a wasteful number, since it uses less digits than its factorization.

2121211125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3413 (or 3397 counting only the distinct ones).

The product of its digits is 80, while the sum is 18.

The square root of 2121211125 is about 46056.6078321016. The cubic root of 2121211125 is about 1284.8762415698.

Adding to 2121211125 its reverse (5211121212), we get a palindrome (7332332337).

The spelling of 2121211125 in words is "two billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-five".