43155231221771 has 2 divisors, whose sum is σ = 43155231221772. Its totient is φ = 43155231221770.

The previous prime is 43155231221699. The next prime is 43155231221831. The reversal of 43155231221771 is 17712213255134.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43155231221771 - 2⁴² = 38757184710667 is a prime.

It is not a weakly prime, because it can be changed into another prime (43155231221371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21577615610885 + 21577615610886.

It is an arithmetic number, because the mean of its divisors is an integer number (21577615610886).

Almost surely, 2^{43155231221771} is an apocalyptic number.

43155231221771 is a deficient number, since it is larger than the sum of its proper divisors (1).

43155231221771 is an equidigital number, since it uses as much as digits as its factorization.

43155231221771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 352800, while the sum is 44.

The spelling of 43155231221771 in words is "forty-three trillion, one hundred fifty-five billion, two hundred thirty-one million, two hundred twenty-one thousand, seven hundred seventy-one".