21341221044 has 96 divisors (see below), whose sum is σ = 59605870464. Its totient is φ = 5856913920.

The previous prime is 21341221037. The next prime is 21341221087. The reversal of 21341221044 is 44012214312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26379 + ... + 208274.

It is an arithmetic number, because the mean of its divisors is an integer number (620894484).

Almost surely, 2^21341221044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21341221044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29802935232).

21341221044 is an abundant number, since it is smaller than the sum of its proper divisors (38264649420).

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

21341221044 is a wasteful number, since it uses less digits than its factorization.

21341221044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234737 (or 234735 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21341221044 its reverse (44012214312), we get a palindrome (65353435356).

The spelling of 21341221044 in words is "twenty-one billion, three hundred forty-one million, two hundred twenty-one thousand, forty-four".