210101120210021 has 2 divisors, whose sum is σ = 210101120210022. Its totient is φ = 210101120210020.

The previous prime is 210101120209999. The next prime is 210101120210027. The reversal of 210101120210021 is 120012021101012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160298262201025 + 49802858008996 = 12660895^2 + 7057114^2 .

It is a cyclic number.

It is not a de Polignac number, because 210101120210021 - 2¹⁰ = 210101120208997 is a prime.

It is a super-2 number, since 2×210101120210021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210101120209978 and 210101120210005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210101120210027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050560105010 + 105050560105011.

It is an arithmetic number, because the mean of its divisors is an integer number (105050560105011).

Almost surely, 2^{210101120210021} is an apocalyptic number.

It is an amenable number.

210101120210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210101120210021 is an equidigital number, since it uses as much as digits as its factorization.

210101120210021 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 210101120210021 its reverse (120012021101012), we get a palindrome (330113141311033).

The spelling of 210101120210021 in words is "two hundred ten trillion, one hundred one billion, one hundred twenty million, two hundred ten thousand, twenty-one".