21143434 has 8 divisors (see below), whose sum is σ = 34154820. Its totient is φ = 9758496.

The previous prime is 21143411. The next prime is 21143453. The reversal of 21143434 is 43434112.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 11025 = 4597^2 + 105^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 406579 + ... + 406630.

Almost surely, 2^21143434 is an apocalyptic number.

21143434 is a deficient number, since it is larger than the sum of its proper divisors (13011386).

21143434 is a wasteful number, since it uses less digits than its factorization.

21143434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813224.

The product of its digits is 1152, while the sum is 22.

The square root of 21143434 is about 4598.1989952589. The cubic root of 21143434 is about 276.5191255395.

Adding to 21143434 its reverse (43434112), we get a palindrome (64577546).

The spelling of 21143434 in words is "twenty-one million, one hundred forty-three thousand, four hundred thirty-four".