1021111012001 has 4 divisors (see below), whose sum is σ = 1021128408132. Its totient is φ = 1021093615872.

The previous prime is 1021111011989. The next prime is 1021111012013. The reversal of 1021111012001 is 1002101111201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1021111011989) and next prime (1021111012013).

It can be written as a sum of positive squares in 2 ways, for example, as 108992419600 + 912118592401 = 330140^2 + 955049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021111012001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021111012021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8609720 + ... + 8727513.

It is an arithmetic number, because the mean of its divisors is an integer number (255282102033).

Almost surely, 2^{1021111012001} is an apocalyptic number.

It is an amenable number.

1021111012001 is a deficient number, since it is larger than the sum of its proper divisors (17396131).

1021111012001 is an equidigital number, since it uses as much as digits as its factorization.

1021111012001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17396130.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 1021111012001 its reverse (1002101111201), we get a palindrome (2023212123202).

The spelling of 1021111012001 in words is "one trillion, twenty-one billion, one hundred eleven million, twelve thousand, one".