21223113120 has 144 divisors (see below), whose sum is σ = 79007920992. Its totient is φ = 5144993280.

The previous prime is 21223113103. The next prime is 21223113139. The reversal of 21223113120 is 2131132212.

21223113120 is a `hidden beast` number, since 21 + 22 + 311 + 312 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×21223113120² (a number of 21 digits) contains 22 as substring.

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 = 21223113093 and 21223113102.

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, 654082 + ... + 685761.

It is an arithmetic number, because the mean of its divisors is an integer number (548666118).

Almost surely, 2^21223113120 is an apocalyptic number.

21223113120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223113120 is an abundant number, since it is smaller than the sum of its proper divisors (57784807872).

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

21223113120 is a wasteful number, since it uses less digits than its factorization.

21223113120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339875 (or 1339864 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21223113120 its reverse (2131132212), we get a palindrome (23354245332).

The spelling of 21223113120 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirteen thousand, one hundred twenty".