121312211311 has 2 divisors, whose sum is σ = 121312211312. Its totient is φ = 121312211310.

The previous prime is 121312211239. The next prime is 121312211347. The reversal of 121312211311 is 113112213121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121312211311 - 2¹³ = 121312203119 is a prime.

It is a super-2 number, since 2×121312211311² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121312311311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60656105655 + 60656105656.

It is an arithmetic number, because the mean of its divisors is an integer number (60656105656).

Almost surely, 2^121312211311 is an apocalyptic number.

121312211311 is a deficient number, since it is larger than the sum of its proper divisors (1).

121312211311 is an equidigital number, since it uses as much as digits as its factorization.

121312211311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 19.

Adding to 121312211311 its reverse (113112213121), we get a palindrome (234424424432).

The spelling of 121312211311 in words is "one hundred twenty-one billion, three hundred twelve million, two hundred eleven thousand, three hundred eleven".