21000200111123 has 2 divisors, whose sum is σ = 21000200111124. Its totient is φ = 21000200111122.

The previous prime is 21000200111039. The next prime is 21000200111131. The reversal of 21000200111123 is 32111100200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000200111123 - 2⁸ = 21000200110867 is a prime.

It is a super-2 number, since 2×21000200111123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000200111098 and 21000200111107.

It is not a weakly prime, because it can be changed into another prime (21000200111183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500100055561 + 10500100055562.

It is an arithmetic number, because the mean of its divisors is an integer number (10500100055562).

Almost surely, 2^{21000200111123} is an apocalyptic number.

21000200111123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000200111123 is an equidigital number, since it uses as much as digits as its factorization.

21000200111123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21000200111123 its reverse (32111100200012), we get a palindrome (53111300311135).

The spelling of 21000200111123 in words is "twenty-one trillion, two hundred million, one hundred eleven thousand, one hundred twenty-three".