21233300220424 has 8 divisors (see below), whose sum is σ = 39812437913310. Its totient is φ = 10616650110208.

The previous prime is 21233300220361. The next prime is 21233300220427. The reversal of 21233300220424 is 42402200333212.

It can be written as a sum of positive squares in only one way, i.e., 13594101732324 + 7639198488100 = 3687018^2 + 2763910^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21233300220392 and 21233300220401.

It is not an unprimeable number, because it can be changed into a prime (21233300220427) 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 as a sum of consecutive naturals, namely, 1327081263769 + ... + 1327081263784.

Almost surely, 2^{21233300220424} is an apocalyptic number.

It is an amenable number.

21233300220424 is a deficient number, since it is larger than the sum of its proper divisors (18579137692886).

21233300220424 is a wasteful number, since it uses less digits than its factorization.

21233300220424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654162527559 (or 2654162527555 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21233300220424 its reverse (42402200333212), we get a palindrome (63635500553636).

The spelling of 21233300220424 in words is "twenty-one trillion, two hundred thirty-three billion, three hundred million, two hundred twenty thousand, four hundred twenty-four".