21974719 has 8 divisors (see below), whose sum is σ = 23965760. Its totient is φ = 20026656.

The previous prime is 21974717. The next prime is 21974731. The reversal of 21974719 is 91747912.

21974719 = T₁₀₄₂ + T₁₀₄₃ + ... + T₁₀₈₀.

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

It is not a de Polignac number, because 21974719 - 2¹ = 21974717 is a prime.

It is a super-2 number, since 2×21974719² = 965776550257922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21974717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9672 + ... + 11725.

It is an arithmetic number, because the mean of its divisors is an integer number (2995720).

Almost surely, 2^21974719 is an apocalyptic number.

21974719 is a deficient number, since it is larger than the sum of its proper divisors (1991041).

21974719 is a wasteful number, since it uses less digits than its factorization.

21974719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21489.

The product of its digits is 31752, while the sum is 40.

The square root of 21974719 is about 4687.7200215030. The cubic root of 21974719 is about 280.0965610838.

The spelling of 21974719 in words is "twenty-one million, nine hundred seventy-four thousand, seven hundred nineteen".