21223302120 has 96 divisors (see below), whose sum is σ = 70839985320. Its totient is φ = 5506583040.

The previous prime is 21223302109. The next prime is 21223302143. The reversal of 21223302120 is 2120332212.

21223302120 is a `hidden beast` number, since 2 + 122 + 330 + 212 + 0 = 666.

21223302120 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 4 ways, for example, as 20517124644 + 706177476 = 143238^2 + 26574^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21223302093 and 21223302102.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 783351 + ... + 809990.

Almost surely, 2^21223302120 is an apocalyptic number.

21223302120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223302120 is an abundant number, since it is smaller than the sum of its proper divisors (49616683200).

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

21223302120 is a wasteful number, since it uses less digits than its factorization.

21223302120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593395 (or 1593388 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21223302120 its reverse (2120332212), we get a palindrome (23343634332).

The spelling of 21223302120 in words is "twenty-one billion, two hundred twenty-three million, three hundred two thousand, one hundred twenty".