21542027 has 8 divisors (see below), whose sum is σ = 23693376. Its totient is φ = 19461312.

The previous prime is 21541979. The next prime is 21542063. The reversal of 21542027 is 72024512.

It is a happy number.

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

It is not a de Polignac number, because 21542027 - 2⁶ = 21541963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21541993 and 21542011.

It is not an unprimeable number, because it can be changed into a prime (21541027) 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, 17018 + ... + 18239.

It is an arithmetic number, because the mean of its divisors is an integer number (2961672).

Almost surely, 2^21542027 is an apocalyptic number.

21542027 is a deficient number, since it is larger than the sum of its proper divisors (2151349).

21542027 is a wasteful number, since it uses less digits than its factorization.

21542027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35317.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21542027 is about 4641.3389231988. The cubic root of 21542027 is about 278.2459523073.

Adding to 21542027 its reverse (72024512), we get a palindrome (93566539).

The spelling of 21542027 in words is "twenty-one million, five hundred forty-two thousand, twenty-seven".