21121002111043 has 2 divisors, whose sum is σ = 21121002111044. Its totient is φ = 21121002111042.

The previous prime is 21121002110947. The next prime is 21121002111049. The reversal of 21121002111043 is 34011120012112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121002111043 - 2⁹ = 21121002110531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21121002111043.

It is not a weakly prime, because it can be changed into another prime (21121002111049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560501055521 + 10560501055522.

It is an arithmetic number, because the mean of its divisors is an integer number (10560501055522).

Almost surely, 2^{21121002111043} is an apocalyptic number.

21121002111043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121002111043 is an equidigital number, since it uses as much as digits as its factorization.

21121002111043 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 21121002111043 its reverse (34011120012112), we get a palindrome (55132122123155).

The spelling of 21121002111043 in words is "twenty-one trillion, one hundred twenty-one billion, two million, one hundred eleven thousand, forty-three".