21254419 has 4 divisors (see below), whose sum is σ = 21987360. Its totient is φ = 20521480.

The previous prime is 21254417. The next prime is 21254447. The reversal of 21254419 is 91445212.

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 21254419 - 2¹ = 21254417 is a prime.

It is a super-2 number, since 2×21254419² = 903500654055122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21254411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366427 + ... + 366484.

It is an arithmetic number, because the mean of its divisors is an integer number (5496840).

Almost surely, 2^21254419 is an apocalyptic number.

21254419 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21254419 is a deficient number, since it is larger than the sum of its proper divisors (732941).

21254419 is an equidigital number, since it uses as much as digits as its factorization.

21254419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732940.

The product of its digits is 2880, while the sum is 28.

The square root of 21254419 is about 4610.2515115772. The cubic root of 21254419 is about 277.0021113108.

The spelling of 21254419 in words is "twenty-one million, two hundred fifty-four thousand, four hundred nineteen".