2153933921 has 2 divisors, whose sum is σ = 2153933922. Its totient is φ = 2153933920.

The previous prime is 2153933897. The next prime is 2153933933. The reversal of 2153933921 is 1293393512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1788359521 + 365574400 = 42289^2 + 19120^2 .

It is a cyclic number.

It is not a de Polignac number, because 2153933921 - 2⁶ = 2153933857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2153933521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1076966960 + 1076966961.

It is an arithmetic number, because the mean of its divisors is an integer number (1076966961).

Almost surely, 2^2153933921 is an apocalyptic number.

It is an amenable number.

2153933921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2153933921 is an equidigital number, since it uses as much as digits as its factorization.

2153933921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 38.

The square root of 2153933921 is about 46410.4936517594. The cubic root of 2153933921 is about 1291.4495895449.

The spelling of 2153933921 in words is "two billion, one hundred fifty-three million, nine hundred thirty-three thousand, nine hundred twenty-one".