21131121301123 has 2 divisors, whose sum is σ = 21131121301124. Its totient is φ = 21131121301122.

The previous prime is 21131121301097. The next prime is 21131121301127. The reversal of 21131121301123 is 32110312113112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21131121301123 is a prime.

It is a super-2 number, since 2×21131121301123² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21131121301094 and 21131121301103.

It is not a weakly prime, because it can be changed into another prime (21131121301127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565560650561 + 10565560650562.

It is an arithmetic number, because the mean of its divisors is an integer number (10565560650562).

Almost surely, 2^{21131121301123} is an apocalyptic number.

21131121301123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131121301123 is an equidigital number, since it uses as much as digits as its factorization.

21131121301123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 21131121301123 its reverse (32110312113112), we get a palindrome (53241433414235).

The spelling of 21131121301123 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred twenty-one million, three hundred one thousand, one hundred twenty-three".