21404321032 has 8 divisors (see below), whose sum is σ = 40133101950. Its totient is φ = 10702160512.

The previous prime is 21404321023. The next prime is 21404321033. The reversal of 21404321032 is 23012340412.

It can be written as a sum of positive squares in only one way, i.e., 19269326596 + 2134994436 = 138814^2 + 46206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21404320994 and 21404321012.

It is not an unprimeable number, because it can be changed into a prime (21404321033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1337770057 + ... + 1337770072.

Almost surely, 2^21404321032 is an apocalyptic number.

It is an amenable number.

21404321032 is a deficient number, since it is larger than the sum of its proper divisors (18728780918).

21404321032 is a wasteful number, since it uses less digits than its factorization.

21404321032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675540135 (or 2675540131 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21404321032 its reverse (23012340412), we get a palindrome (44416661444).

The spelling of 21404321032 in words is "twenty-one billion, four hundred four million, three hundred twenty-one thousand, thirty-two".