21446433400 has 96 divisors (see below), whose sum is σ = 57539888640. Its totient is φ = 7281624960.

The previous prime is 21446433391. The next prime is 21446433413. The reversal of 21446433400 is 433464412.

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, 69837 + ... + 218563.

It is an arithmetic number, because the mean of its divisors is an integer number (599373840).

Almost surely, 2^21446433400 is an apocalyptic number.

21446433400 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 21446433400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28769944320).

21446433400 is an abundant number, since it is smaller than the sum of its proper divisors (36093455240).

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

21446433400 is a wasteful number, since it uses less digits than its factorization.

21446433400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148853 (or 148844 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21446433400 its reverse (433464412), we get a palindrome (21879897812).

The spelling of 21446433400 in words is "twenty-one billion, four hundred forty-six million, four hundred thirty-three thousand, four hundred".