21240422404212 has 48 divisors (see below), whose sum is σ = 54674018884800. Its totient is φ = 6364171503360.

The previous prime is 21240422404211. The next prime is 21240422404249.

21240422404212 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 21240422404212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240422404211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 903989887 + ... + 904013382.

It is an arithmetic number, because the mean of its divisors is an integer number (1139042060100).

Almost surely, 2^{21240422404212} is an apocalyptic number.

21240422404212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21240422404212 is an abundant number, since it is smaller than the sum of its proper divisors (33433596480588).

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

21240422404212 is a wasteful number, since it uses less digits than its factorization.

21240422404212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1808003376 (or 1808003374 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

It can be divided in two parts, 2124042 and 2404212, that added together give a palindrome (4528254).

The spelling of 21240422404212 in words is "twenty-one trillion, two hundred forty billion, four hundred twenty-two million, four hundred four thousand, two hundred twelve".