12211020971 has 2 divisors, whose sum is σ = 12211020972. Its totient is φ = 12211020970.

The previous prime is 12211020959. The next prime is 12211021037. The reversal of 12211020971 is 17902011221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211020971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12211020971.

It is not a weakly prime, because it can be changed into another prime (12211020901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6105510485 + 6105510486.

It is an arithmetic number, because the mean of its divisors is an integer number (6105510486).

Almost surely, 2^12211020971 is an apocalyptic number.

12211020971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12211020971 is an equidigital number, since it uses as much as digits as its factorization.

12211020971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 26.

The spelling of 12211020971 in words is "twelve billion, two hundred eleven million, twenty thousand, nine hundred seventy-one".