1001102120021 has 2 divisors, whose sum is σ = 1001102120022. Its totient is φ = 1001102120020.

The previous prime is 1001102120009. The next prime is 1001102120023. The reversal of 1001102120021 is 1200212011001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 700085297521 + 301016822500 = 836711^2 + 548650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001102120021 - 2²² = 1001097925717 is a prime.

Together with 1001102120023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1001102119984 and 1001102120011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001102120023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500551060010 + 500551060011.

It is an arithmetic number, because the mean of its divisors is an integer number (500551060011).

Almost surely, 2^{1001102120021} is an apocalyptic number.

It is an amenable number.

1001102120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001102120021 is an equidigital number, since it uses as much as digits as its factorization.

1001102120021 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 1001102120021 its reverse (1200212011001), we get a palindrome (2201314131022).

The spelling of 1001102120021 in words is "one trillion, one billion, one hundred two million, one hundred twenty thousand, twenty-one".