21952427 has 8 divisors (see below), whose sum is σ = 25127136. Its totient is φ = 18787392.

The previous prime is 21952387. The next prime is 21952459. The reversal of 21952427 is 72425912.

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 21952427 - 2²⁰ = 20903851 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21952393 and 21952402.

It is not an unprimeable number, because it can be changed into a prime (21952477) 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, 3383 + ... + 7439.

It is an arithmetic number, because the mean of its divisors is an integer number (3140892).

Almost surely, 2^21952427 is an apocalyptic number.

21952427 is a deficient number, since it is larger than the sum of its proper divisors (3174709).

21952427 is an equidigital number, since it uses as much as digits as its factorization.

21952427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4837.

The product of its digits is 10080, while the sum is 32.

The square root of 21952427 is about 4685.3417164600. The cubic root of 21952427 is about 280.0018154644.

The spelling of 21952427 in words is "twenty-one million, nine hundred fifty-two thousand, four hundred twenty-seven".