21232123100220 has 72 divisors (see below), whose sum is σ = 63152709452784. Its totient is φ = 5328846577664.

The previous prime is 21232123100219. The next prime is 21232123100231. The reversal of 21232123100220 is 2200132123212.

It is a congruent number.

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, 612212277 + ... + 612246956.

It is an arithmetic number, because the mean of its divisors is an integer number (877120964622).

Almost surely, 2^{21232123100220} is an apocalyptic number.

21232123100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21232123100220 is an abundant number, since it is smaller than the sum of its proper divisors (41920586352564).

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

21232123100220 is a wasteful number, since it uses less digits than its factorization.

21232123100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224459279 (or 1224459260 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21232123100220 its reverse (2200132123212), we get a palindrome (23432255223432).

The spelling of 21232123100220 in words is "twenty-one trillion, two hundred thirty-two billion, one hundred twenty-three million, one hundred thousand, two hundred twenty".