21401331232 has 24 divisors (see below), whose sum is σ = 42225296652. Its totient is φ = 10677446400.

The previous prime is 21401331227. The next prime is 21401331239. The reversal of 21401331232 is 23213310412.

It can be written as a sum of positive squares in 2 ways, for example, as 21399008656 + 2322576 = 146284^2 + 1524^2 .

It is not an unprimeable number, because it can be changed into a prime (21401331239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710619 + ... + 740122.

Almost surely, 2^21401331232 is an apocalyptic number.

It is an amenable number.

21401331232 is a deficient number, since it is larger than the sum of its proper divisors (20823965420).

21401331232 is a wasteful number, since it uses less digits than its factorization.

21401331232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451212 (or 1451204 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21401331232 its reverse (23213310412), we get a palindrome (44614641644).

The spelling of 21401331232 in words is "twenty-one billion, four hundred one million, three hundred thirty-one thousand, two hundred thirty-two".