21013461 has 24 divisors (see below), whose sum is σ = 34841664. Its totient is φ = 11954880.

The previous prime is 21013459. The next prime is 21013483. The reversal of 21013461 is 16431012.

It is a happy number.

It is not a de Polignac number, because 21013461 - 2¹ = 21013459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013451) 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 23 ways as a sum of consecutive naturals, for example, 17110 + ... + 18296.

It is an arithmetic number, because the mean of its divisors is an integer number (1451736).

Almost surely, 2^21013461 is an apocalyptic number.

21013461 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21013461 is a deficient number, since it is larger than the sum of its proper divisors (13828203).

21013461 is a wasteful number, since it uses less digits than its factorization.

21013461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21013461 is about 4584.0441751798. The cubic root of 21013461 is about 275.9513540604.

Adding to 21013461 its reverse (16431012), we get a palindrome (37444473).

The spelling of 21013461 in words is "twenty-one million, thirteen thousand, four hundred sixty-one".