121221201331 has 2 divisors, whose sum is σ = 121221201332. Its totient is φ = 121221201330.

The previous prime is 121221201329. The next prime is 121221201371. The reversal of 121221201331 is 133102122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221201331 - 2¹ = 121221201329 is a prime.

It is a super-2 number, since 2×121221201331² (a number of 23 digits) contains 22 as substring.

Together with 121221201329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121221201299 and 121221201308.

It is not a weakly prime, because it can be changed into another prime (121221201371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610600665 + 60610600666.

It is an arithmetic number, because the mean of its divisors is an integer number (60610600666).

Almost surely, 2^121221201331 is an apocalyptic number.

121221201331 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221201331 is an equidigital number, since it uses as much as digits as its factorization.

121221201331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121221201331 its reverse (133102122121), we get a palindrome (254323323452).

The spelling of 121221201331 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, three hundred thirty-one".