21111212010223 has 2 divisors, whose sum is σ = 21111212010224. Its totient is φ = 21111212010222.

The previous prime is 21111212010193. The next prime is 21111212010233. The reversal of 21111212010223 is 32201021211112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21111212010223 - 2²⁵ = 21111178455791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21111212010223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111212010233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555606005111 + 10555606005112.

It is an arithmetic number, because the mean of its divisors is an integer number (10555606005112).

Almost surely, 2^{21111212010223} is an apocalyptic number.

21111212010223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111212010223 is an equidigital number, since it uses as much as digits as its factorization.

21111212010223 is an evil number, because the sum of its binary digits is even.

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

Adding to 21111212010223 its reverse (32201021211112), we get a palindrome (53312233221335).

The spelling of 21111212010223 in words is "twenty-one trillion, one hundred eleven billion, two hundred twelve million, ten thousand, two hundred twenty-three".