100121102021 has 2 divisors, whose sum is σ = 100121102022. Its totient is φ = 100121102020.

The previous prime is 100121101999. The next prime is 100121102023. The reversal of 100121102021 is 120201121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73596093796 + 26525008225 = 271286^2 + 162865^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121102021 - 2⁶ = 100121101957 is a prime.

Together with 100121102023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100121101993 and 100121102011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121102023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060551010 + 50060551011.

It is an arithmetic number, because the mean of its divisors is an integer number (50060551011).

Almost surely, 2^100121102021 is an apocalyptic number.

It is an amenable number.

100121102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121102021 is an equidigital number, since it uses as much as digits as its factorization.

100121102021 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 11.

Adding to 100121102021 its reverse (120201121001), we get a palindrome (220322223022).

The spelling of 100121102021 in words is "one hundred billion, one hundred twenty-one million, one hundred two thousand, twenty-one".