20210101210121 has 2 divisors, whose sum is σ = 20210101210122. Its totient is φ = 20210101210120.

The previous prime is 20210101210043. The next prime is 20210101210127. The reversal of 20210101210121 is 12101210101202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19963569099721 + 246532110400 = 4468061^2 + 496520^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210101210121 - 2³⁴ = 20192921340937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210101210096 and 20210101210105.

It is not a weakly prime, because it can be changed into another prime (20210101210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105050605060 + 10105050605061.

It is an arithmetic number, because the mean of its divisors is an integer number (10105050605061).

Almost surely, 2^{20210101210121} is an apocalyptic number.

It is an amenable number.

20210101210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210101210121 is an equidigital number, since it uses as much as digits as its factorization.

20210101210121 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 20210101210121 its reverse (12101210101202), we get a palindrome (32311311311323).

The spelling of 20210101210121 in words is "twenty trillion, two hundred ten billion, one hundred one million, two hundred ten thousand, one hundred twenty-one".