21230120233 has 16 divisors (see below), whose sum is σ = 24322083840. Its totient is φ = 18152989200.

The previous prime is 21230120203. The next prime is 21230120237. The reversal of 21230120233 is 33202103212.

It is a cyclic number.

It is not a de Polignac number, because 21230120233 - 2³³ = 12640185641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21230120233.

It is not an unprimeable number, because it can be changed into a prime (21230120237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7829748 + ... + 7832458.

It is an arithmetic number, because the mean of its divisors is an integer number (1520130240).

Almost surely, 2^21230120233 is an apocalyptic number.

It is an amenable number.

21230120233 is a deficient number, since it is larger than the sum of its proper divisors (3091963607).

21230120233 is a wasteful number, since it uses less digits than its factorization.

21230120233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21230120233 its reverse (33202103212), we get a palindrome (54432223445).

The spelling of 21230120233 in words is "twenty-one billion, two hundred thirty million, one hundred twenty thousand, two hundred thirty-three".