21403043440232 has 8 divisors (see below), whose sum is σ = 40130706450450. Its totient is φ = 10701521720112.

The previous prime is 21403043440223. The next prime is 21403043440237. The reversal of 21403043440232 is 23204434030412.

It can be written as a sum of positive squares in only one way, i.e., 21270304176676 + 132739263556 = 4611974^2 + 364334^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21403043440237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1337690215007 + ... + 1337690215022.

Almost surely, 2^{21403043440232} is an apocalyptic number.

It is an amenable number.

21403043440232 is a deficient number, since it is larger than the sum of its proper divisors (18727663010218).

21403043440232 is a wasteful number, since it uses less digits than its factorization.

21403043440232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675380430035 (or 2675380430031 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21403043440232 its reverse (23204434030412), we get a palindrome (44607477470644).

The spelling of 21403043440232 in words is "twenty-one trillion, four hundred three billion, forty-three million, four hundred forty thousand, two hundred thirty-two".