21012321332 has 12 divisors (see below), whose sum is σ = 36772587936. Its totient is φ = 10505867640.

The previous prime is 21012321289. The next prime is 21012321371. The reversal of 21012321332 is 23312321012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208457 + ... + 292367.

It is an arithmetic number, because the mean of its divisors is an integer number (3064382328).

Almost surely, 2^21012321332 is an apocalyptic number.

It is an amenable number.

21012321332 is a deficient number, since it is larger than the sum of its proper divisors (15760266604).

21012321332 is a wasteful number, since it uses less digits than its factorization.

21012321332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146518 (or 146516 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21012321332 its reverse (23312321012), we get a palindrome (44324642344).

The spelling of 21012321332 in words is "twenty-one billion, twelve million, three hundred twenty-one thousand, three hundred thirty-two".