21030211210123 has 2 divisors, whose sum is σ = 21030211210124. Its totient is φ = 21030211210122.

The previous prime is 21030211210103. The next prime is 21030211210171. The reversal of 21030211210123 is 32101211203012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21030211210123 - 2⁵ = 21030211210091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21030211210123.

It is not a weakly prime, because it can be changed into another prime (21030211210103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515105605061 + 10515105605062.

It is an arithmetic number, because the mean of its divisors is an integer number (10515105605062).

Almost surely, 2^{21030211210123} is an apocalyptic number.

21030211210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030211210123 is an equidigital number, since it uses as much as digits as its factorization.

21030211210123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21030211210123 its reverse (32101211203012), we get a palindrome (53131422413135).

The spelling of 21030211210123 in words is "twenty-one trillion, thirty billion, two hundred eleven million, two hundred ten thousand, one hundred twenty-three".