121021001311 has 16 divisors (see below), whose sum is σ = 140329635840. Its totient is φ = 102222394560.

The previous prime is 121021001303. The next prime is 121021001323. The reversal of 121021001311 is 113100120121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121021001311 - 2³ = 121021001303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021001291 and 121021001300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021001351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78090 + ... + 498136.

It is an arithmetic number, because the mean of its divisors is an integer number (8770602240).

Almost surely, 2^121021001311 is an apocalyptic number.

121021001311 is a deficient number, since it is larger than the sum of its proper divisors (19308634529).

121021001311 is an equidigital number, since it uses as much as digits as its factorization.

121021001311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420654.

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

Adding to 121021001311 its reverse (113100120121), we get a palindrome (234121121432).

The spelling of 121021001311 in words is "one hundred twenty-one billion, twenty-one million, one thousand, three hundred eleven".