21110471402752 has 144 divisors (see below), whose sum is σ = 46426286011392. Its totient is φ = 9539513384960.

The previous prime is 21110471402747. The next prime is 21110471402753. The reversal of 21110471402752 is 25720417401112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110471402753) 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, 9867177 + ... + 11814487.

It is an arithmetic number, because the mean of its divisors is an integer number (322404763968).

Almost surely, 2^{21110471402752} 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 21110471402752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23213143005696).

21110471402752 is an abundant number, since it is smaller than the sum of its proper divisors (25315814608640).

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

21110471402752 is a wasteful number, since it uses less digits than its factorization.

21110471402752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1947444 (or 1947430 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

Adding to 21110471402752 its reverse (25720417401112), we get a palindrome (46830888803864).

The spelling of 21110471402752 in words is "twenty-one trillion, one hundred ten billion, four hundred seventy-one million, four hundred two thousand, seven hundred fifty-two".