21293419 has 4 divisors (see below), whose sum is σ = 24335344. Its totient is φ = 18251496.

The previous prime is 21293407. The next prime is 21293429. The reversal of 21293419 is 91439212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21293419 - 2⁵ = 21293387 is a prime.

It is a super-2 number, since 2×21293419² = 906819385419122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21293429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1520952 + ... + 1520965.

It is an arithmetic number, because the mean of its divisors is an integer number (6083836).

Almost surely, 2^21293419 is an apocalyptic number.

21293419 is a deficient number, since it is larger than the sum of its proper divisors (3041925).

21293419 is an equidigital number, since it uses as much as digits as its factorization.

21293419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041924.

The product of its digits is 3888, while the sum is 31.

The square root of 21293419 is about 4614.4792772316. The cubic root of 21293419 is about 277.1714326724.

It can be divided in two parts, 21293 and 419, that added together give a palindrome (21712).

The spelling of 21293419 in words is "twenty-one million, two hundred ninety-three thousand, four hundred nineteen".