1001212001021 has 2 divisors, whose sum is σ = 1001212001022. Its totient is φ = 1001212001020.

The previous prime is 1001212000993. The next prime is 1001212001029. The reversal of 1001212001021 is 1201002121001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 854304609796 + 146907391225 = 924286^2 + 383285^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001212001021 - 2¹⁴ = 1001211984637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001212000993 and 1001212001011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001212001029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500606000510 + 500606000511.

It is an arithmetic number, because the mean of its divisors is an integer number (500606000511).

Almost surely, 2^{1001212001021} is an apocalyptic number.

It is an amenable number.

1001212001021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001212001021 is an equidigital number, since it uses as much as digits as its factorization.

1001212001021 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 1001212001021 its reverse (1201002121001), we get a palindrome (2202214122022).

The spelling of 1001212001021 in words is "one trillion, one billion, two hundred twelve million, one thousand, twenty-one".