21203123119 has 2 divisors, whose sum is σ = 21203123120. Its totient is φ = 21203123118.

The previous prime is 21203123107. The next prime is 21203123143. The reversal of 21203123119 is 91132130212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21203123119 - 2¹⁷ = 21202992047 is a prime.

It is a super-2 number, since 2×21203123119² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21203123093 and 21203123102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203123159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601561559 + 10601561560.

It is an arithmetic number, because the mean of its divisors is an integer number (10601561560).

Almost surely, 2^21203123119 is an apocalyptic number.

21203123119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203123119 is an equidigital number, since it uses as much as digits as its factorization.

21203123119 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The spelling of 21203123119 in words is "twenty-one billion, two hundred three million, one hundred twenty-three thousand, one hundred nineteen".