21254119 has 2 divisors, whose sum is σ = 21254120. Its totient is φ = 21254118.

The previous prime is 21254117. The next prime is 21254143. The reversal of 21254119 is 91145212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21254119 - 2¹ = 21254117 is a prime.

It is a super-2 number, since 2×21254119² = 903475148932322, which contains 22 as substring.

Together with 21254117, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21254093 and 21254102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21254117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627059 + 10627060.

It is an arithmetic number, because the mean of its divisors is an integer number (10627060).

Almost surely, 2^21254119 is an apocalyptic number.

21254119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21254119 is an equidigital number, since it uses as much as digits as its factorization.

21254119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 25.

The square root of 21254119 is about 4610.2189752766. The cubic root of 21254119 is about 277.0008080363. Note that the first 3 decimals are identical.

The spelling of 21254119 in words is "twenty-one million, two hundred fifty-four thousand, one hundred nineteen".