21022234 has 8 divisors (see below), whose sum is σ = 33388308. Its totient is φ = 9892800.

The previous prime is 21022223. The next prime is 21022249. The reversal of 21022234 is 43222012.

It can be written as a sum of positive squares in 2 ways, for example, as 21022225 + 9 = 4585^2 + 3^2 .

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, 309117 + ... + 309184.

Almost surely, 2^21022234 is an apocalyptic number.

21022234 is a deficient number, since it is larger than the sum of its proper divisors (12366074).

21022234 is a wasteful number, since it uses less digits than its factorization.

21022234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618320.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21022234 is about 4585.0009814612. Note that the first 3 decimals coincide. The cubic root of 21022234 is about 275.9897514223.

Adding to 21022234 its reverse (43222012), we get a palindrome (64244246).

The spelling of 21022234 in words is "twenty-one million, twenty-two thousand, two hundred thirty-four".