2193940921 has 2 divisors, whose sum is σ = 2193940922. Its totient is φ = 2193940920.

The previous prime is 2193940913. The next prime is 2193940949. The reversal of 2193940921 is 1290493912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2066702521 + 127238400 = 45461^2 + 11280^2 .

It is a cyclic number.

It is not a de Polignac number, because 2193940921 - 2³ = 2193940913 is a prime.

It is not a weakly prime, because it can be changed into another prime (2193940981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096970460 + 1096970461.

It is an arithmetic number, because the mean of its divisors is an integer number (1096970461).

Almost surely, 2^2193940921 is an apocalyptic number.

It is an amenable number.

2193940921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193940921 is an equidigital number, since it uses as much as digits as its factorization.

2193940921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 2193940921 is about 46839.5230654626. The cubic root of 2193940921 is about 1299.3963511028.

The spelling of 2193940921 in words is "two billion, one hundred ninety-three million, nine hundred forty thousand, nine hundred twenty-one".