21143104 has 28 divisors (see below), whose sum is σ = 44426124. Its totient is φ = 9949184.

The previous prime is 21143081. The next prime is 21143113. The reversal of 21143104 is 40134112.

It can be written as a sum of positive squares in 2 ways, for example, as 8526400 + 12616704 = 2920^2 + 3552^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8629 + ... + 10804.

Almost surely, 2^21143104 is an apocalyptic number.

It is an amenable number.

21143104 is an abundant number, since it is smaller than the sum of its proper divisors (23283020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21143104 is a wasteful number, since it uses less digits than its factorization.

21143104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19462 (or 19452 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21143104 is about 4598.1631115044. The cubic root of 21143104 is about 276.5176869244.

Adding to 21143104 its reverse (40134112), we get a palindrome (61277216).

The spelling of 21143104 in words is "twenty-one million, one hundred forty-three thousand, one hundred four".