21232110201220 has 72 divisors (see below), whose sum is σ = 47045914461504. Its totient is φ = 8047668159168.

The previous prime is 21232110201191. The next prime is 21232110201227. The reversal of 21232110201220 is 2210201123212.

It is not an unprimeable number, because it can be changed into a prime (21232110201227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8245584 + ... + 10509703.

It is an arithmetic number, because the mean of its divisors is an integer number (653415478632).

Almost surely, 2^{21232110201220} is an apocalyptic number.

21232110201220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232110201220 is an abundant number, since it is smaller than the sum of its proper divisors (25813804260284).

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

21232110201220 is a wasteful number, since it uses less digits than its factorization.

21232110201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18755449 (or 18755424 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21232110201220 its reverse (2210201123212), we get a palindrome (23442311324432).

The spelling of 21232110201220 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred ten million, two hundred one thousand, two hundred twenty".