21223245124 has 27 divisors (see below), whose sum is σ = 38837963647. Its totient is φ = 10147042664.

The previous prime is 21223245049. The next prime is 21223245143. The reversal of 21223245124 is 42154232212.

The square root of 21223245124 is 145682.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×21223245124² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21223245092 and 21223245101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6699789 + ... + 6702955.

Almost surely, 2^21223245124 is an apocalyptic number.

21223245124 is the 145682-nd square number.

It is an amenable number.

21223245124 is a deficient number, since it is larger than the sum of its proper divisors (17614718523).

21223245124 is an frugal number, since it uses more digits than its factorization.

21223245124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6384 (or 3192 counting only the distinct ones).

The product of its digits is 7680, while the sum is 28.

Adding to 21223245124 its reverse (42154232212), we get a palindrome (63377477336).

The spelling of 21223245124 in words is "twenty-one billion, two hundred twenty-three million, two hundred forty-five thousand, one hundred twenty-four".