21324121332 has 24 divisors (see below), whose sum is σ = 49854050400. Its totient is φ = 7094073696.

The previous prime is 21324121321. The next prime is 21324121337. The reversal of 21324121332 is 23312142312.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21324121337) 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, 1739482 + ... + 1751697.

It is an arithmetic number, because the mean of its divisors is an integer number (2077252100).

Almost surely, 2^21324121332 is an apocalyptic number.

It is an amenable number.

21324121332 is an abundant number, since it is smaller than the sum of its proper divisors (28529929068).

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

21324121332 is a wasteful number, since it uses less digits than its factorization.

21324121332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3491695 (or 3491693 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 21324121332 its reverse (23312142312), we get a palindrome (44636263644).

The spelling of 21324121332 in words is "twenty-one billion, three hundred twenty-four million, one hundred twenty-one thousand, three hundred thirty-two".