21050234 has 4 divisors (see below), whose sum is σ = 31575354. Its totient is φ = 10525116.

The previous prime is 21050231. The next prime is 21050251. The reversal of 21050234 is 43205012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19829209 + 1221025 = 4453^2 + 1105^2 .

It is a super-2 number, since 2×21050234² = 886224702909512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21050231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5262557 + ... + 5262560.

Almost surely, 2^21050234 is an apocalyptic number.

21050234 is a deficient number, since it is larger than the sum of its proper divisors (10525120).

21050234 is a wasteful number, since it uses less digits than its factorization.

21050234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10525119.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21050234 is about 4588.0533998636. The cubic root of 21050234 is about 276.1122294404.

Adding to 21050234 its reverse (43205012), we get a palindrome (64255246).

The spelling of 21050234 in words is "twenty-one million, fifty thousand, two hundred thirty-four".