121021320311 has 2 divisors, whose sum is σ = 121021320312. Its totient is φ = 121021320310.

The previous prime is 121021320257. The next prime is 121021320319. The reversal of 121021320311 is 113023120121.

It is a strong prime.

It is an emirp because it is prime and its reverse (113023120121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021320311 is a prime.

It is a super-2 number, since 2×121021320311² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121021320311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021320319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510660155 + 60510660156.

It is an arithmetic number, because the mean of its divisors is an integer number (60510660156).

Almost surely, 2^121021320311 is an apocalyptic number.

121021320311 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021320311 is an equidigital number, since it uses as much as digits as its factorization.

121021320311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121021320311 its reverse (113023120121), we get a palindrome (234044440432).

The spelling of 121021320311 in words is "one hundred twenty-one billion, twenty-one million, three hundred twenty thousand, three hundred eleven".