21444025043100 has 144 divisors (see below), whose sum is σ = 67702461515136. Its totient is φ = 5197221216000.

The previous prime is 21444025043053. The next prime is 21444025043101. The reversal of 21444025043100 is 134052044412.

It is a super-2 number, since 2×21444025043100² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21444025043101) 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, 12096615 + ... + 13755585.

It is an arithmetic number, because the mean of its divisors is an integer number (470155982744).

Almost surely, 2^{21444025043100} is an apocalyptic number.

21444025043100 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 21444025043100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33851230757568).

21444025043100 is an abundant number, since it is smaller than the sum of its proper divisors (46258436472036).

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

21444025043100 is a wasteful number, since it uses less digits than its factorization.

21444025043100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662916 (or 1662909 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21444025043100 its reverse (134052044412), we get a palindrome (21578077087512).

The spelling of 21444025043100 in words is "twenty-one trillion, four hundred forty-four billion, twenty-five million, forty-three thousand, one hundred".