21122111212043 has 2 divisors, whose sum is σ = 21122111212044. Its totient is φ = 21122111212042.

The previous prime is 21122111211931. The next prime is 21122111212201. The reversal of 21122111212043 is 34021211122112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21122111212043 - 2¹⁴ = 21122111195659 is a prime.

It is a super-2 number, since 2×21122111212043² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21122111212843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561055606021 + 10561055606022.

It is an arithmetic number, because the mean of its divisors is an integer number (10561055606022).

Almost surely, 2^{21122111212043} is an apocalyptic number.

21122111212043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21122111212043 is an equidigital number, since it uses as much as digits as its factorization.

21122111212043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

Adding to 21122111212043 its reverse (34021211122112), we get a palindrome (55143322334155).

The spelling of 21122111212043 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, forty-three".