21262427 has 8 divisors (see below), whose sum is σ = 22598352. Its totient is φ = 19936000.

The previous prime is 21262411. The next prime is 21262429. The reversal of 21262427 is 72426212.

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 21262427 - 2⁴ = 21262411 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21262396 and 21262405.

It is not an unprimeable number, because it can be changed into a prime (21262429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2552 + ... + 7002.

It is an arithmetic number, because the mean of its divisors is an integer number (2824794).

Almost surely, 2^21262427 is an apocalyptic number.

21262427 is a deficient number, since it is larger than the sum of its proper divisors (1335925).

21262427 is a wasteful number, since it uses less digits than its factorization.

21262427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4749.

The product of its digits is 2688, while the sum is 26.

The square root of 21262427 is about 4611.1199290411. The cubic root of 21262427 is about 277.0368955185.

Adding to 21262427 its reverse (72426212), we get a palindrome (93688639).

The spelling of 21262427 in words is "twenty-one million, two hundred sixty-two thousand, four hundred twenty-seven".