2121121550 has 12 divisors (see below), whose sum is σ = 3945286176. Its totient is φ = 848448600.

The previous prime is 2121121537. The next prime is 2121121573. The reversal of 2121121550 is 551211212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21211166 + ... + 21211265.

It is an arithmetic number, because the mean of its divisors is an integer number (328773848).

Almost surely, 2^2121121550 is an apocalyptic number.

2121121550 is a deficient number, since it is larger than the sum of its proper divisors (1824164626).

2121121550 is a wasteful number, since it uses less digits than its factorization.

2121121550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42422443 (or 42422438 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2121121550 is about 46055.6353772261. The cubic root of 2121121550 is about 1284.8581552969.

Adding to 2121121550 its reverse (551211212), we get a palindrome (2672332762).

The spelling of 2121121550 in words is "two billion, one hundred twenty-one million, one hundred twenty-one thousand, five hundred fifty".