21542483 has 2 divisors, whose sum is σ = 21542484. Its totient is φ = 21542482.

The previous prime is 21542459. The next prime is 21542537. The reversal of 21542483 is 38424512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21542483 - 2¹⁶ = 21476947 is a prime.

It is not a weakly prime, because it can be changed into another prime (21542413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10771241 + 10771242.

It is an arithmetic number, because the mean of its divisors is an integer number (10771242).

Almost surely, 2^21542483 is an apocalyptic number.

21542483 is a deficient number, since it is larger than the sum of its proper divisors (1).

21542483 is an equidigital number, since it uses as much as digits as its factorization.

21542483 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7680, while the sum is 29.

The square root of 21542483 is about 4641.3880466947. The cubic root of 21542483 is about 278.2479155899.

Adding to 21542483 its reverse (38424512), we get a palindrome (59966995).

The spelling of 21542483 in words is "twenty-one million, five hundred forty-two thousand, four hundred eighty-three".