21132251342552 has 128 divisors (see below), whose sum is σ = 46398968985600. Its totient is φ = 8836215049728.

The previous prime is 21132251342509. The next prime is 21132251342591. The reversal of 21132251342552 is 25524315223112.

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, 1236301718 + ... + 1236318810.

It is an arithmetic number, because the mean of its divisors is an integer number (362491945200).

Almost surely, 2^{21132251342552} 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 21132251342552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23199484492800).

21132251342552 is an abundant number, since it is smaller than the sum of its proper divisors (25266717643048).

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

21132251342552 is a wasteful number, since it uses less digits than its factorization.

21132251342552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20305 (or 20301 counting only the distinct ones).

The product of its digits is 144000, while the sum is 38.

Adding to 21132251342552 its reverse (25524315223112), we get a palindrome (46656566565664).

The spelling of 21132251342552 in words is "twenty-one trillion, one hundred thirty-two billion, two hundred fifty-one million, three hundred forty-two thousand, five hundred fifty-two".