21727419 has 8 divisors (see below), whose sum is σ = 33108480. Its totient is φ = 12415656.

The previous prime is 21727397. The next prime is 21727429. The reversal of 21727419 is 91472712.

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

It is not a de Polignac number, because 21727419 - 2¹² = 21723323 is a prime.

It is a super-2 number, since 2×21727419² = 944161472803122, 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 21727419.

It is not an unprimeable number, because it can be changed into a prime (21727429) 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 7 ways as a sum of consecutive naturals, for example, 517299 + ... + 517340.

It is an arithmetic number, because the mean of its divisors is an integer number (4138560).

Almost surely, 2^21727419 is an apocalyptic number.

21727419 is a deficient number, since it is larger than the sum of its proper divisors (11381061).

21727419 is a wasteful number, since it uses less digits than its factorization.

21727419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1034649.

The product of its digits is 7056, while the sum is 33.

The square root of 21727419 is about 4661.2679605446. The cubic root of 21727419 is about 279.0418739581.

It can be divided in two parts, 2172 and 7419, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 21727419 in words is "twenty-one million, seven hundred twenty-seven thousand, four hundred nineteen".