21341481 has 16 divisors (see below), whose sum is σ = 32732544. Its totient is φ = 12115584.

The previous prime is 21341479. The next prime is 21341491. The reversal of 21341481 is 18414312.

It is not a de Polignac number, because 21341481 - 2¹ = 21341479 is a prime.

It is a super-2 number, since 2×21341481² = 910917622546722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21341491) 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 15 ways as a sum of consecutive naturals, for example, 61 + ... + 6533.

It is an arithmetic number, because the mean of its divisors is an integer number (2045784).

Almost surely, 2^21341481 is an apocalyptic number.

21341481 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21341481 is a deficient number, since it is larger than the sum of its proper divisors (11391063).

21341481 is a wasteful number, since it uses less digits than its factorization.

21341481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6640.

The product of its digits is 768, while the sum is 24.

The square root of 21341481 is about 4619.6840801076. The cubic root of 21341481 is about 277.3798132246.

Adding to 21341481 its reverse (18414312), we get a palindrome (39755793).

The spelling of 21341481 in words is "twenty-one million, three hundred forty-one thousand, four hundred eighty-one".