21223304524 has 12 divisors (see below), whose sum is σ = 37841552784. Its totient is φ = 10411432304.

The previous prime is 21223304521. The next prime is 21223304563. The reversal of 21223304524 is 42540332212.

It is a junction number, because it is equal to n+sod(n) for n = 21223304492 and 21223304501.

It is not an unprimeable number, because it can be changed into a prime (21223304521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50054752 + ... + 50055175.

It is an arithmetic number, because the mean of its divisors is an integer number (3153462732).

Almost surely, 2^21223304524 is an apocalyptic number.

It is an amenable number.

21223304524 is a deficient number, since it is larger than the sum of its proper divisors (16618248260).

21223304524 is a wasteful number, since it uses less digits than its factorization.

21223304524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100109984 (or 100109982 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

Adding to 21223304524 its reverse (42540332212), we get a palindrome (63763636736).

The spelling of 21223304524 in words is "twenty-one billion, two hundred twenty-three million, three hundred four thousand, five hundred twenty-four".