20201200111021 has 2 divisors, whose sum is σ = 20201200111022. Its totient is φ = 20201200111020.

The previous prime is 20201200110997. The next prime is 20201200111031. The reversal of 20201200111021 is 12011100210202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12488837942025 + 7712362168996 = 3533955^2 + 2777114^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201200111021 - 2⁷ = 20201200110893 is a prime.

It is a super-3 number, since 3×20201200111021³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20201200110992 and 20201200111010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201200111031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100600055510 + 10100600055511.

It is an arithmetic number, because the mean of its divisors is an integer number (10100600055511).

Almost surely, 2^{20201200111021} is an apocalyptic number.

It is an amenable number.

20201200111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201200111021 is an equidigital number, since it uses as much as digits as its factorization.

20201200111021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20201200111021 its reverse (12011100210202), we get a palindrome (32212300321223).

The spelling of 20201200111021 in words is "twenty trillion, two hundred one billion, two hundred million, one hundred eleven thousand, twenty-one".