21132343320 has 128 divisors (see below), whose sum is σ = 69508800000. Its totient is φ = 5097185280.

The previous prime is 21132343319. The next prime is 21132343321. The reversal of 21132343320 is 2334323112.

It is an interprime number because it is at equal distance from previous prime (21132343319) and next prime (21132343321).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132343321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222456 + ... + 302904.

It is an arithmetic number, because the mean of its divisors is an integer number (543037500).

Almost surely, 2^21132343320 is an apocalyptic number.

21132343320 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 21132343320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34754400000).

21132343320 is an abundant number, since it is smaller than the sum of its proper divisors (48376456680).

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

21132343320 is a wasteful number, since it uses less digits than its factorization.

21132343320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80673 (or 80669 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21132343320 its reverse (2334323112), we get a palindrome (23466666432).

The spelling of 21132343320 in words is "twenty-one billion, one hundred thirty-two million, three hundred forty-three thousand, three hundred twenty".