210102121081 has 2 divisors, whose sum is σ = 210102121082. Its totient is φ = 210102121080.

The previous prime is 210102121063. The next prime is 210102121129. The reversal of 210102121081 is 180121201012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203910949225 + 6191171856 = 451565^2 + 78684^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210102121081 is a prime.

It is a super-2 number, since 2×210102121081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210102122081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105051060540 + 105051060541.

It is an arithmetic number, because the mean of its divisors is an integer number (105051060541).

Almost surely, 2^210102121081 is an apocalyptic number.

It is an amenable number.

210102121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210102121081 is an equidigital number, since it uses as much as digits as its factorization.

210102121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 210102121081 its reverse (180121201012), we get a palindrome (390223322093).

The spelling of 210102121081 in words is "two hundred ten billion, one hundred two million, one hundred twenty-one thousand, eighty-one".