21412143 has 12 divisors (see below), whose sum is σ = 30994600. Its totient is φ = 14244336.

The previous prime is 21412133. The next prime is 21412177. The reversal of 21412143 is 34121412.

It is not a de Polignac number, because 21412143 - 2¹² = 21408047 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2433 + ... + 6981.

Almost surely, 2^21412143 is an apocalyptic number.

21412143 is a deficient number, since it is larger than the sum of its proper divisors (9582457).

21412143 is a wasteful number, since it uses less digits than its factorization.

21412143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5078 (or 5075 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21412143 is about 4627.3256855337. The cubic root of 21412143 is about 277.6856123685.

Adding to 21412143 its reverse (34121412), we get a palindrome (55533555).

It can be divided in two parts, 21 and 412143, that added together give a square (412164 = 642²).

The spelling of 21412143 in words is "twenty-one million, four hundred twelve thousand, one hundred forty-three".