21221333223120 has 80 divisors (see below), whose sum is σ = 73095703331520. Its totient is φ = 5659022192256.

The previous prime is 21221333223023. The next prime is 21221333223131. The reversal of 21221333223120 is 2132233312212.

21221333223120 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 13 + 332 + 2 + 312 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4912343494 + ... + 4912347813.

It is an arithmetic number, because the mean of its divisors is an integer number (913696291644).

Almost surely, 2^{21221333223120} is an apocalyptic number.

21221333223120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221333223120 is an abundant number, since it is smaller than the sum of its proper divisors (51874370108400).

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

21221333223120 is a wasteful number, since it uses less digits than its factorization.

21221333223120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9824691329 (or 9824691317 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 21221333223120 its reverse (2132233312212), we get a palindrome (23353566535332).

The spelling of 21221333223120 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred thirty-three million, two hundred twenty-three thousand, one hundred twenty".