20211100102121 has 2 divisors, whose sum is σ = 20211100102122. Its totient is φ = 20211100102120.

The previous prime is 20211100102111. The next prime is 20211100102157. The reversal of 20211100102121 is 12120100111202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20026878019600 + 184222082521 = 4475140^2 + 429211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211100102121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20211100102096 and 20211100102105.

It is not a weakly prime, because it can be changed into another prime (20211100102111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105550051060 + 10105550051061.

It is an arithmetic number, because the mean of its divisors is an integer number (10105550051061).

Almost surely, 2^{20211100102121} is an apocalyptic number.

It is an amenable number.

20211100102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211100102121 is an equidigital number, since it uses as much as digits as its factorization.

20211100102121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20211100102121 its reverse (12120100111202), we get a palindrome (32331200213323).

The spelling of 20211100102121 in words is "twenty trillion, two hundred eleven billion, one hundred million, one hundred two thousand, one hundred twenty-one".