100121100211021 has 2 divisors, whose sum is σ = 100121100211022. Its totient is φ = 100121100211020.

The previous prime is 100121100210941. The next prime is 100121100211043. The reversal of 100121100211021 is 120112001121001.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93567141806121 + 6553958404900 = 9673011^2 + 2560070^2 .

It is an emirp because it is prime and its reverse (120112001121001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100121100211021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100121100210992 and 100121100211010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121100311021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060550105510 + 50060550105511.

It is an arithmetic number, because the mean of its divisors is an integer number (50060550105511).

Almost surely, 2^{100121100211021} is an apocalyptic number.

It is an amenable number.

100121100211021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121100211021 is an equidigital number, since it uses as much as digits as its factorization.

100121100211021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 100121100211021 its reverse (120112001121001), we get a palindrome (220233101332022).

The spelling of 100121100211021 in words is "one hundred trillion, one hundred twenty-one billion, one hundred million, two hundred eleven thousand, twenty-one".