1000020210121 has 2 divisors, whose sum is σ = 1000020210122. Its totient is φ = 1000020210120.

The previous prime is 1000020210113. The next prime is 1000020210127. The reversal of 1000020210121 is 1210120200001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827017454025 + 173002756096 = 909405^2 + 415936^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000020210121 - 2³ = 1000020210113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1000020210098 and 1000020210107.

It is not a weakly prime, because it can be changed into another prime (1000020210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500010105060 + 500010105061.

It is an arithmetic number, because the mean of its divisors is an integer number (500010105061).

Almost surely, 2^{1000020210121} is an apocalyptic number.

It is an amenable number.

1000020210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000020210121 is an equidigital number, since it uses as much as digits as its factorization.

1000020210121 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 10.

Adding to 1000020210121 its reverse (1210120200001), we get a palindrome (2210140410122).

The spelling of 1000020210121 in words is "one trillion, twenty million, two hundred ten thousand, one hundred twenty-one".