21203234 has 32 divisors (see below), whose sum is σ = 36091440. Its totient is φ = 9273600.

The previous prime is 21203219. The next prime is 21203249. The reversal of 21203234 is 43230212.

It is an interprime number because it is at equal distance from previous prime (21203219) and next prime (21203249).

It can be written as a sum of positive squares in 8 ways, for example, as 908209 + 20295025 = 953^2 + 4505^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45764 + ... + 46224.

Almost surely, 2^21203234 is an apocalyptic number.

21203234 is a deficient number, since it is larger than the sum of its proper divisors (14888206).

21203234 is a wasteful number, since it uses less digits than its factorization.

21203234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 21203234 is about 4604.6969498546. The cubic root of 21203234 is about 276.7795732780.

Adding to 21203234 its reverse (43230212), we get a palindrome (64433446).

The spelling of 21203234 in words is "twenty-one million, two hundred three thousand, two hundred thirty-four".