21011234 has 4 divisors (see below), whose sum is σ = 31516854. Its totient is φ = 10505616.

The previous prime is 21011233. The next prime is 21011239. The reversal of 21011234 is 43211012.

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., 13432225 + 7579009 = 3665^2 + 2753^2 .

It is not an unprimeable number, because it can be changed into a prime (21011231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5252807 + ... + 5252810.

Almost surely, 2^21011234 is an apocalyptic number.

21011234 is a deficient number, since it is larger than the sum of its proper divisors (10505620).

21011234 is a wasteful number, since it uses less digits than its factorization.

21011234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10505619.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21011234 is about 4583.8012609623. The cubic root of 21011234 is about 275.9416053034.

Adding to 21011234 its reverse (43211012), we get a palindrome (64222246).

The spelling of 21011234 in words is "twenty-one million, eleven thousand, two hundred thirty-four".