210121212101 has 2 divisors, whose sum is σ = 210121212102. Its totient is φ = 210121212100.

The previous prime is 210121212071. The next prime is 210121212109. The reversal of 210121212101 is 101212121012.

210121212101 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191844876001 + 18276336100 = 438001^2 + 135190^2 .

It is a cyclic number.

It is not a de Polignac number, because 210121212101 - 2³⁴ = 192941342917 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210121212109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060606050 + 105060606051.

It is an arithmetic number, because the mean of its divisors is an integer number (105060606051).

Almost surely, 2^210121212101 is an apocalyptic number.

It is an amenable number.

210121212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121212101 is an equidigital number, since it uses as much as digits as its factorization.

210121212101 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 210121212101 its reverse (101212121012), we get a palindrome (311333333113).

It can be divided in two parts, 2 and 10121212101, that multiplied together give a palindrome (20242424202).

The spelling of 210121212101 in words is "two hundred ten billion, one hundred twenty-one million, two hundred twelve thousand, one hundred one".