2120121993 has 16 divisors (see below), whose sum is σ = 3104243712. Its totient is φ = 1276410000.

The previous prime is 2120121967. The next prime is 2120122001. The reversal of 2120121993 is 3991210212.

It is not a de Polignac number, because 2120121993 - 2⁸ = 2120121737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2120121993.

It is not an unprimeable number, because it can be changed into a prime (2120121293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207753 + ... + 217718.

It is an arithmetic number, because the mean of its divisors is an integer number (194015232).

Almost surely, 2^2120121993 is an apocalyptic number.

It is an amenable number.

2120121993 is a deficient number, since it is larger than the sum of its proper divisors (984121719).

2120121993 is a wasteful number, since it uses less digits than its factorization.

2120121993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425636.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 2120121993 is about 46044.7824731532. The cubic root of 2120121993 is about 1284.6562981313.

The spelling of 2120121993 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, nine hundred ninety-three".