43121210112121 has 2 divisors, whose sum is σ = 43121210112122. Its totient is φ = 43121210112120.

The previous prime is 43121210112037. The next prime is 43121210112133. The reversal of 43121210112121 is 12121101212134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41074768281600 + 2046441830521 = 6408960^2 + 1430539^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121210112121 - 2³⁵ = 43086850373753 is a prime.

It is a super-2 number, since 2×43121210112121² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43121210112092 and 43121210112101.

It is not a weakly prime, because it can be changed into another prime (43121210112181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560605056060 + 21560605056061.

It is an arithmetic number, because the mean of its divisors is an integer number (21560605056061).

Almost surely, 2^{43121210112121} is an apocalyptic number.

It is an amenable number.

43121210112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121210112121 is an equidigital number, since it uses as much as digits as its factorization.

43121210112121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 43121210112121 its reverse (12121101212134), we get a palindrome (55242311324255).

The spelling of 43121210112121 in words is "forty-three trillion, one hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, one hundred twenty-one".