100120121081 has 2 divisors, whose sum is σ = 100120121082. Its totient is φ = 100120121080.

The previous prime is 100120121071. The next prime is 100120121131. The reversal of 100120121081 is 180121021001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63156213481 + 36963907600 = 251309^2 + 192260^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100120121081 is a prime.

It is a super-2 number, since 2×100120121081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100120121071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060060540 + 50060060541.

It is an arithmetic number, because the mean of its divisors is an integer number (50060060541).

Almost surely, 2^100120121081 is an apocalyptic number.

It is an amenable number.

100120121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

100120121081 is an equidigital number, since it uses as much as digits as its factorization.

100120121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 100120121081 its reverse (180121021001), we get a palindrome (280241142082).

The spelling of 100120121081 in words is "one hundred billion, one hundred twenty million, one hundred twenty-one thousand, eighty-one".