21457419 has 8 divisors (see below), whose sum is σ = 29596560. Its totient is φ = 13811616.

The previous prime is 21457411. The next prime is 21457433. The reversal of 21457419 is 91475412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21457419 - 2³ = 21457411 is a prime.

It is a super-2 number, since 2×21457419² = 920841660283122, 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 21457419.

It is not an unprimeable number, because it can be changed into a prime (21457411) 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, 123232 + ... + 123405.

It is an arithmetic number, because the mean of its divisors is an integer number (3699570).

Almost surely, 2^21457419 is an apocalyptic number.

21457419 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21457419 is a deficient number, since it is larger than the sum of its proper divisors (8139141).

21457419 is a wasteful number, since it uses less digits than its factorization.

21457419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246669.

The product of its digits is 10080, while the sum is 33.

The square root of 21457419 is about 4632.2153447352. The cubic root of 21457419 is about 277.8811967567.

The spelling of 21457419 in words is "twenty-one million, four hundred fifty-seven thousand, four hundred nineteen".