1000012020121 has 2 divisors, whose sum is σ = 1000012020122. Its totient is φ = 1000012020120.

The previous prime is 1000012020097. The next prime is 1000012020149. The reversal of 1000012020121 is 1210202100001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 744663717721 + 255348302400 = 862939^2 + 505320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000012020121 - 2⁵ = 1000012020089 is a prime.

It is a super-3 number, since 3×1000012020121³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1000012020098 and 1000012020107.

It is not a weakly prime, because it can be changed into another prime (1000012020151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500006010060 + 500006010061.

It is an arithmetic number, because the mean of its divisors is an integer number (500006010061).

Almost surely, 2^{1000012020121} is an apocalyptic number.

It is an amenable number.

1000012020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000012020121 is an equidigital number, since it uses as much as digits as its factorization.

1000012020121 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 1000012020121 its reverse (1210202100001), we get a palindrome (2210214120122).

The spelling of 1000012020121 in words is "one trillion, twelve million, twenty thousand, one hundred twenty-one".