1021001001121 has 4 divisors (see below), whose sum is σ = 1021003092144. Its totient is φ = 1020998910100.

The previous prime is 1021001001101. The next prime is 1021001001127. The reversal of 1021001001121 is 1211001001201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1021001001121 - 2⁷ = 1021001000993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021001001098 and 1021001001107.

It is not an unprimeable number, because it can be changed into a prime (1021001001127) 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, 120006 + ... + 1434016.

It is an arithmetic number, because the mean of its divisors is an integer number (255250773036).

Almost surely, 2^{1021001001121} is an apocalyptic number.

It is an amenable number.

1021001001121 is a deficient number, since it is larger than the sum of its proper divisors (2091023).

1021001001121 is an equidigital number, since it uses as much as digits as its factorization.

1021001001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091022.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1021001001121 its reverse (1211001001201), we get a palindrome (2232002002322).

The spelling of 1021001001121 in words is "one trillion, twenty-one billion, one million, one thousand, one hundred twenty-one".