21123119 has 2 divisors, whose sum is σ = 21123120. Its totient is φ = 21123118.

The previous prime is 21123103. The next prime is 21123133. The reversal of 21123119 is 91132112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21123119 - 2⁴ = 21123103 is a prime.

It is a super-2 number, since 2×21123119² = 892372312576322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21123119.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21123149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10561559 + 10561560.

It is an arithmetic number, because the mean of its divisors is an integer number (10561560).

Almost surely, 2^21123119 is an apocalyptic number.

21123119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21123119 is an equidigital number, since it uses as much as digits as its factorization.

21123119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 20.

The square root of 21123119 is about 4595.9894473334. The cubic root of 21123119 is about 276.4305356077.

The spelling of 21123119 in words is "twenty-one million, one hundred twenty-three thousand, one hundred nineteen".