21223234 has 4 divisors (see below), whose sum is σ = 31834854. Its totient is φ = 10611616.

The previous prime is 21223219. The next prime is 21223261. The reversal of 21223234 is 43232212.

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., 18037009 + 3186225 = 4247^2 + 1785^2 .

It is a super-2 number, since 2×21223234² = 900851322837512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305807 + ... + 5305810.

Almost surely, 2^21223234 is an apocalyptic number.

21223234 is a deficient number, since it is larger than the sum of its proper divisors (10611620).

21223234 is a wasteful number, since it uses less digits than its factorization.

21223234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10611619.

The product of its digits is 576, while the sum is 19.

The square root of 21223234 is about 4606.8681335588. The cubic root of 21223234 is about 276.8665702567.

Adding to 21223234 its reverse (43232212), we get a palindrome (64455446).

It can be divided in two parts, 2122 and 3234, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 21223234 in words is "twenty-one million, two hundred twenty-three thousand, two hundred thirty-four".