43121210111281 has 2 divisors, whose sum is σ = 43121210111282. Its totient is φ = 43121210111280.

The previous prime is 43121210111261. The next prime is 43121210111381. The reversal of 43121210111281 is 18211101212134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33672963671281 + 9448246440000 = 5802841^2 + 3073800^2 .

It is a cyclic number.

It is not a de Polignac number, because 43121210111281 - 2³⁷ = 42983771157809 is a prime.

It is a super-2 number, since 2×43121210111281² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43121210111261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21560605055640 + 21560605055641.

It is an arithmetic number, because the mean of its divisors is an integer number (21560605055641).

Almost surely, 2^{43121210111281} is an apocalyptic number.

It is an amenable number.

43121210111281 is a deficient number, since it is larger than the sum of its proper divisors (1).

43121210111281 is an equidigital number, since it uses as much as digits as its factorization.

43121210111281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 28.

The spelling of 43121210111281 in words is "forty-three trillion, one hundred twenty-one billion, two hundred ten million, one hundred eleven thousand, two hundred eighty-one".