21111214123 has 2 divisors, whose sum is σ = 21111214124. Its totient is φ = 21111214122.

The previous prime is 21111214121. The next prime is 21111214141. The reversal of 21111214123 is 32141211112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111214123 - 2¹ = 21111214121 is a prime.

Together with 21111214121, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21111214123.

It is not a weakly prime, because it can be changed into another prime (21111214121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555607061 + 10555607062.

It is an arithmetic number, because the mean of its divisors is an integer number (10555607062).

Almost surely, 2^21111214123 is an apocalyptic number.

21111214123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111214123 is an equidigital number, since it uses as much as digits as its factorization.

21111214123 is an evil number, because the sum of its binary digits is even.

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

Adding to 21111214123 its reverse (32141211112), we get a palindrome (53252425235).

The spelling of 21111214123 in words is "twenty-one billion, one hundred eleven million, two hundred fourteen thousand, one hundred twenty-three".