1021231110001 has 2 divisors, whose sum is σ = 1021231110002. Its totient is φ = 1021231110000.

The previous prime is 1021231109993. The next prime is 1021231110013. The reversal of 1021231110001 is 1000111321201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1019445624976 + 1785485025 = 1009676^2 + 42255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021231110001 - 2³ = 1021231109993 is a prime.

It is a super-3 number, since 3×1021231110001³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1021231110071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510615555000 + 510615555001.

It is an arithmetic number, because the mean of its divisors is an integer number (510615555001).

Almost surely, 2^{1021231110001} is an apocalyptic number.

It is an amenable number.

1021231110001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021231110001 is an equidigital number, since it uses as much as digits as its factorization.

1021231110001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 1021231110001 its reverse (1000111321201), we get a palindrome (2021342431202).

The spelling of 1021231110001 in words is "one trillion, twenty-one billion, two hundred thirty-one million, one hundred ten thousand, one".