20202121101121 has 2 divisors, whose sum is σ = 20202121101122. Its totient is φ = 20202121101120.

The previous prime is 20202121101079. The next prime is 20202121101137. The reversal of 20202121101121 is 12110112120202.

It is an a-pointer prime, because the next prime (20202121101137) can be obtained adding 20202121101121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18494394861121 + 1707726240000 = 4300511^2 + 1306800^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202121101121 - 2¹⁷ = 20202120970049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20202121101095 and 20202121101104.

It is not a weakly prime, because it can be changed into another prime (20202121101161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101060550560 + 10101060550561.

It is an arithmetic number, because the mean of its divisors is an integer number (10101060550561).

Almost surely, 2^{20202121101121} is an apocalyptic number.

It is an amenable number.

20202121101121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202121101121 is an equidigital number, since it uses as much as digits as its factorization.

20202121101121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20202121101121 its reverse (12110112120202), we get a palindrome (32312233221323).

It can be divided in two parts, 20202 and 121101121, that multiplied together give a palindrome (2446484846442).

The spelling of 20202121101121 in words is "twenty trillion, two hundred two billion, one hundred twenty-one million, one hundred one thousand, one hundred twenty-one".