21352236352 has 56 divisors (see below), whose sum is σ = 43655970600. Its totient is φ = 10356842496.

The previous prime is 21352236337. The next prime is 21352236359. The reversal of 21352236352 is 25363225312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3370499136 + 17981737216 = 58056^2 + 134096^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352236359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266524 + ... + 337252.

Almost surely, 2^21352236352 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 21352236352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21827985300).

21352236352 is an abundant number, since it is smaller than the sum of its proper divisors (22303734248).

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

21352236352 is an equidigital number, since it uses as much as digits as its factorization.

21352236352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70883 (or 70873 counting only the distinct ones).

The product of its digits is 64800, while the sum is 34.

The spelling of 21352236352 in words is "twenty-one billion, three hundred fifty-two million, two hundred thirty-six thousand, three hundred fifty-two".