21354219 has 8 divisors (see below), whose sum is σ = 31635920. Its totient is φ = 14236128.

The previous prime is 21354197. The next prime is 21354241. The reversal of 21354219 is 91245312.

It is an interprime number because it is at equal distance from previous prime (21354197) and next prime (21354241).

It is not a de Polignac number, because 21354219 - 2⁸ = 21353963 is a prime.

It is a super-2 number, since 2×21354219² = 912005338199922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 790897 = 21354219 / (2 + 1 + 3 + 5 + 4 + 2 + 1 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21354192 and 21354201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395422 + ... + 395475.

It is an arithmetic number, because the mean of its divisors is an integer number (3954490).

Almost surely, 2^21354219 is an apocalyptic number.

21354219 is a deficient number, since it is larger than the sum of its proper divisors (10281701).

21354219 is an equidigital number, since it uses as much as digits as its factorization.

21354219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790906 (or 790900 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21354219 is about 4621.0625401524. The cubic root of 21354219 is about 277.4349884228.

The spelling of 21354219 in words is "twenty-one million, three hundred fifty-four thousand, two hundred nineteen".