2131222311709 has 2 divisors, whose sum is σ = 2131222311710. Its totient is φ = 2131222311708.

The previous prime is 2131222311679. The next prime is 2131222311721. The reversal of 2131222311709 is 9071132221312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242897211609 + 888325100100 = 1114853^2 + 942510^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131222311709 - 2²³ = 2131213923101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2131222311749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065611155854 + 1065611155855.

It is an arithmetic number, because the mean of its divisors is an integer number (1065611155855).

Almost surely, 2^{2131222311709} is an apocalyptic number.

It is an amenable number.

2131222311709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131222311709 is an equidigital number, since it uses as much as digits as its factorization.

2131222311709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 34.

The spelling of 2131222311709 in words is "two trillion, one hundred thirty-one billion, two hundred twenty-two million, three hundred eleven thousand, seven hundred nine".