10021211028121 has 2 divisors, whose sum is σ = 10021211028122. Its totient is φ = 10021211028120.

The previous prime is 10021211028109. The next prime is 10021211028173. The reversal of 10021211028121 is 12182011212001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6025453902400 + 3995757125721 = 2454680^2 + 1998939^2 .

It is a cyclic number.

It is not a de Polignac number, because 10021211028121 - 2⁵ = 10021211028089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10021211028092 and 10021211028101.

It is not a weakly prime, because it can be changed into another prime (10021211028181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010605514060 + 5010605514061.

It is an arithmetic number, because the mean of its divisors is an integer number (5010605514061).

Almost surely, 2^{10021211028121} is an apocalyptic number.

It is an amenable number.

10021211028121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10021211028121 is an equidigital number, since it uses as much as digits as its factorization.

10021211028121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 10021211028121 in words is "ten trillion, twenty-one billion, two hundred eleven million, twenty-eight thousand, one hundred twenty-one".