19947224323211 has 2 divisors, whose sum is σ = 19947224323212. Its totient is φ = 19947224323210.

The previous prime is 19947224323177. The next prime is 19947224323223. The reversal of 19947224323211 is 11232342274991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19947224323211 - 2¹⁰ = 19947224322187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19947224323211.

It is not a weakly prime, because it can be changed into another prime (19947224323241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9973612161605 + 9973612161606.

It is an arithmetic number, because the mean of its divisors is an integer number (9973612161606).

Almost surely, 2^{19947224323211} is an apocalyptic number.

19947224323211 is a deficient number, since it is larger than the sum of its proper divisors (1).

19947224323211 is an equidigital number, since it uses as much as digits as its factorization.

19947224323211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 19947224323211 in words is "nineteen trillion, nine hundred forty-seven billion, two hundred twenty-four million, three hundred twenty-three thousand, two hundred eleven".