20202939121 has 2 divisors, whose sum is σ = 20202939122. Its totient is φ = 20202939120.

The previous prime is 20202939091. The next prime is 20202939139. The reversal of 20202939121 is 12193920202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18958260721 + 1244678400 = 137689^2 + 35280^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202939121 - 2⁵ = 20202939089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20202939151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101469560 + 10101469561.

It is an arithmetic number, because the mean of its divisors is an integer number (10101469561).

Almost surely, 2^20202939121 is an apocalyptic number.

It is an amenable number.

20202939121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202939121 is an equidigital number, since it uses as much as digits as its factorization.

20202939121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 20202939121 in words is "twenty billion, two hundred two million, nine hundred thirty-nine thousand, one hundred twenty-one".