21143463 has 32 divisors (see below), whose sum is σ = 32555520. Its totient is φ = 12080640.

The previous prime is 21143459. The next prime is 21143477. The reversal of 21143463 is 36434112.

It is not a de Polignac number, because 21143463 - 2² = 21143459 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143453) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67395 + ... + 67707.

It is an arithmetic number, because the mean of its divisors is an integer number (1017360).

Almost surely, 2^21143463 is an apocalyptic number.

21143463 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21143463 is a deficient number, since it is larger than the sum of its proper divisors (11412057).

21143463 is a wasteful number, since it uses less digits than its factorization.

21143463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439.

The product of its digits is 1728, while the sum is 24.

The square root of 21143463 is about 4598.2021486664. The cubic root of 21143463 is about 276.5192519625.

Adding to 21143463 its reverse (36434112), we get a palindrome (57577575).

The spelling of 21143463 in words is "twenty-one million, one hundred forty-three thousand, four hundred sixty-three".