21222001201120 has 48 divisors (see below), whose sum is σ = 50332063452048. Its totient is φ = 8455770112000.

The previous prime is 21222001200979. The next prime is 21222001201123. The reversal of 21222001201120 is 2110210022212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21222001201094 and 21222001201103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222001201123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258008506 + ... + 258090745.

It is an arithmetic number, because the mean of its divisors is an integer number (1048584655251).

Almost surely, 2^{21222001201120} is an apocalyptic number.

21222001201120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222001201120 is an abundant number, since it is smaller than the sum of its proper divisors (29110062250928).

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

21222001201120 is a wasteful number, since it uses less digits than its factorization.

21222001201120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516099523 (or 516099515 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21222001201120 its reverse (2110210022212), we get a palindrome (23332211223332).

The spelling of 21222001201120 in words is "twenty-one trillion, two hundred twenty-two billion, one million, two hundred one thousand, one hundred twenty".