100121010221021 has 2 divisors, whose sum is σ = 100121010221022. Its totient is φ = 100121010221020.

The previous prime is 100121010220993. The next prime is 100121010221053. The reversal of 100121010221021 is 120122010121001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80121206592025 + 19999803628996 = 8951045^2 + 4472114^2 .

It is a cyclic number.

It is not a de Polignac number, because 100121010221021 - 2³⁸ = 99846132314077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100121010220987 and 100121010221005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100121010421021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060505110510 + 50060505110511.

It is an arithmetic number, because the mean of its divisors is an integer number (50060505110511).

Almost surely, 2^{100121010221021} is an apocalyptic number.

It is an amenable number.

100121010221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100121010221021 is an equidigital number, since it uses as much as digits as its factorization.

100121010221021 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 100121010221021 its reverse (120122010121001), we get a palindrome (220243020342022).

The spelling of 100121010221021 in words is "one hundred trillion, one hundred twenty-one billion, ten million, two hundred twenty-one thousand, twenty-one".