1221010211143 has 2 divisors, whose sum is σ = 1221010211144. Its totient is φ = 1221010211142.

The previous prime is 1221010211093. The next prime is 1221010211227. The reversal of 1221010211143 is 3411120101221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221010211143 - 2²¹ = 1221008113991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221010211143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221010221143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505105571 + 610505105572.

It is an arithmetic number, because the mean of its divisors is an integer number (610505105572).

Almost surely, 2^{1221010211143} is an apocalyptic number.

1221010211143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010211143 is an equidigital number, since it uses as much as digits as its factorization.

1221010211143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1221010211143 its reverse (3411120101221), we get a palindrome (4632130312364).

The spelling of 1221010211143 in words is "one trillion, two hundred twenty-one billion, ten million, two hundred eleven thousand, one hundred forty-three".