21011463 has 24 divisors (see below), whose sum is σ = 33256080. Its totient is φ = 12677760.

The previous prime is 21011453. The next prime is 21011503. The reversal of 21011463 is 36411012.

It is a happy number.

It is not a de Polignac number, because 21011463 - 2⁴ = 21011447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36643 + ... + 37211.

It is an arithmetic number, because the mean of its divisors is an integer number (1385670).

Almost surely, 2^21011463 is an apocalyptic number.

21011463 is a deficient number, since it is larger than the sum of its proper divisors (12244617).

21011463 is a wasteful number, since it uses less digits than its factorization.

21011463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959 (or 956 counting only the distinct ones).

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

The square root of 21011463 is about 4583.8262401623. The cubic root of 21011463 is about 275.9426077893.

Adding to 21011463 its reverse (36411012), we get a palindrome (57422475).

The spelling of 21011463 in words is "twenty-one million, eleven thousand, four hundred sixty-three".