21233770 has 8 divisors (see below), whose sum is σ = 38220804. Its totient is φ = 8493504.

The previous prime is 21233753. The next prime is 21233813. The reversal of 21233770 is 7733212.

It can be written as a sum of positive squares in 2 ways, for example, as 20620681 + 613089 = 4541^2 + 783^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1061679 + ... + 1061698.

Almost surely, 2^21233770 is an apocalyptic number.

21233770 is a deficient number, since it is larger than the sum of its proper divisors (16987034).

21233770 is a wasteful number, since it uses less digits than its factorization.

21233770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123384.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 21233770 is about 4608.0115017218. The cubic root of 21233770 is about 276.9123782864.

Adding to 21233770 its reverse (7733212), we get a palindrome (28966982).

The spelling of 21233770 in words is "twenty-one million, two hundred thirty-three thousand, seven hundred seventy".