21122404511020 has 144 divisors (see below), whose sum is σ = 47212685872128. Its totient is φ = 7936487568000.

The previous prime is 21122404511003. The next prime is 21122404511023. The reversal of 21122404511020 is 2011540422112.

It is not an unprimeable number, because it can be changed into a prime (21122404511023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 404098927 + ... + 404151193.

It is an arithmetic number, because the mean of its divisors is an integer number (327865874112).

Almost surely, 2^{21122404511020} is an apocalyptic number.

21122404511020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21122404511020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23606342936064).

21122404511020 is an abundant number, since it is smaller than the sum of its proper divisors (26090281361108).

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

21122404511020 is a wasteful number, since it uses less digits than its factorization.

21122404511020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52788 (or 52767 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 21122404511020 its reverse (2011540422112), we get a palindrome (23133944933132).

The spelling of 21122404511020 in words is "twenty-one trillion, one hundred twenty-two billion, four hundred four million, five hundred eleven thousand, twenty".