21044441212400 has 30 divisors (see below), whose sum is σ = 50559270013752. Its totient is φ = 8417776484800.

The previous prime is 21044441212391. The next prime is 21044441212471. The reversal of 21044441212400 is 421214444012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26305551116 + ... + 26305551915.

Almost surely, 2^{21044441212400} is an apocalyptic number.

21044441212400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044441212400 is an abundant number, since it is smaller than the sum of its proper divisors (29514828801352).

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

21044441212400 is a wasteful number, since it uses less digits than its factorization.

21044441212400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52611103049 (or 52611103038 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 29.

Adding to 21044441212400 its reverse (421214444012), we get a palindrome (21465655656412).

The spelling of 21044441212400 in words is "twenty-one trillion, forty-four billion, four hundred forty-one million, two hundred twelve thousand, four hundred".