21210212011123 has 2 divisors, whose sum is σ = 21210212011124. Its totient is φ = 21210212011122.

The previous prime is 21210212011103. The next prime is 21210212011141. The reversal of 21210212011123 is 32111021201212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210212011123 - 2¹⁷ = 21210211880051 is a prime.

It is a super-2 number, since 2×21210212011123² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21210212011123.

It is not a weakly prime, because it can be changed into another prime (21210212011103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605106005561 + 10605106005562.

It is an arithmetic number, because the mean of its divisors is an integer number (10605106005562).

Almost surely, 2^{21210212011123} is an apocalyptic number.

21210212011123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210212011123 is an equidigital number, since it uses as much as digits as its factorization.

21210212011123 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 21210212011123 its reverse (32111021201212), we get a palindrome (53321233212335).

The spelling of 21210212011123 in words is "twenty-one trillion, two hundred ten billion, two hundred twelve million, eleven thousand, one hundred twenty-three".