21400144232 has 32 divisors (see below), whose sum is σ = 41559345000. Its totient is φ = 10318549248.

The previous prime is 21400144189. The next prime is 21400144279. The reversal of 21400144232 is 23244100412.

It can be written as a sum of positive squares in 4 ways, for example, as 16756266916 + 4643877316 = 129446^2 + 68146^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21400144198 and 21400144207.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136694 + ... + 247962.

Almost surely, 2^21400144232 is an apocalyptic number.

It is an amenable number.

21400144232 is a deficient number, since it is larger than the sum of its proper divisors (20159200768).

21400144232 is a wasteful number, since it uses less digits than its factorization.

21400144232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112133 (or 112129 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21400144232 its reverse (23244100412), we get a palindrome (44644244644).

The spelling of 21400144232 in words is "twenty-one billion, four hundred million, one hundred forty-four thousand, two hundred thirty-two".