1191647214421 has 2 divisors, whose sum is σ = 1191647214422. Its totient is φ = 1191647214420.

The previous prime is 1191647214403. The next prime is 1191647214437. The reversal of 1191647214421 is 1244127461911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 674845820100 + 516801394321 = 821490^2 + 718889^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191647214421 - 2⁵ = 1191647214389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191647212421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595823607210 + 595823607211.

It is an arithmetic number, because the mean of its divisors is an integer number (595823607211).

Almost surely, 2^{1191647214421} is an apocalyptic number.

It is an amenable number.

1191647214421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191647214421 is an equidigital number, since it uses as much as digits as its factorization.

1191647214421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 43.

The spelling of 1191647214421 in words is "one trillion, one hundred ninety-one billion, six hundred forty-seven million, two hundred fourteen thousand, four hundred twenty-one".