21050434 has 8 divisors (see below), whose sum is σ = 32171580. Its totient is φ = 10326576.

The previous prime is 21050417. The next prime is 21050443. The reversal of 21050434 is 43405012.

It can be written as a sum of positive squares in 2 ways, for example, as 19847025 + 1203409 = 4455^2 + 1097^2 .

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, 99189 + ... + 99400.

Almost surely, 2^21050434 is an apocalyptic number.

21050434 is a deficient number, since it is larger than the sum of its proper divisors (11121146).

21050434 is a wasteful number, since it uses less digits than its factorization.

21050434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198644.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21050434 is about 4588.0751955477. The cubic root of 21050434 is about 276.1131038926.

Adding to 21050434 its reverse (43405012), we get a palindrome (64455446).

The spelling of 21050434 in words is "twenty-one million, fifty thousand, four hundred thirty-four".