21192719 has 8 divisors (see below), whose sum is σ = 21572640. Its totient is φ = 20815200.

The previous prime is 21192713. The next prime is 21192737. The reversal of 21192719 is 91729112.

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

It is a cyclic number.

It is not a de Polignac number, because 21192719 - 2¹² = 21188623 is a prime.

It is a super-2 number, since 2×21192719² = 898262677225922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21192713) 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, 29537 + ... + 30245.

It is an arithmetic number, because the mean of its divisors is an integer number (2696580).

Almost surely, 2^21192719 is an apocalyptic number.

21192719 is a deficient number, since it is larger than the sum of its proper divisors (379921).

21192719 is an equidigital number, since it uses as much as digits as its factorization.

21192719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201.

The product of its digits is 2268, while the sum is 32.

The square root of 21192719 is about 4603.5550393147. Note that the first 3 decimals coincide. The cubic root of 21192719 is about 276.7338126731.

The spelling of 21192719 in words is "twenty-one million, one hundred ninety-two thousand, seven hundred nineteen".