21120505453230 has 64 divisors (see below), whose sum is σ = 54087985232640. Its totient is φ = 5262614758656.

The previous prime is 21120505453169. The next prime is 21120505453253. The reversal of 21120505453230 is 3235450502112.

It is a junction number, because it is equal to n+sod(n) for n = 21120505453191 and 21120505453200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253749612 + ... + 253832831.

It is an arithmetic number, because the mean of its divisors is an integer number (845124769260).

Almost surely, 2^{21120505453230} is an apocalyptic number.

21120505453230 is an abundant number, since it is smaller than the sum of its proper divisors (32967479779410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21120505453230 is a wasteful number, since it uses less digits than its factorization.

21120505453230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507582545.

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 21120505453230 its reverse (3235450502112), we get a palindrome (24355955955342).

The spelling of 21120505453230 in words is "twenty-one trillion, one hundred twenty billion, five hundred five million, four hundred fifty-three thousand, two hundred thirty".