21155003003432 has 16 divisors (see below), whose sum is σ = 39672056389140. Its totient is φ = 10575787966336.

The previous prime is 21155003003261. The next prime is 21155003003441. The reversal of 21155003003432 is 23430030055112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21110661593956 + 44341409476 = 4594634^2 + 210574^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21155003003395 and 21155003003404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214139453 + ... + 214238220.

Almost surely, 2^{21155003003432} is an apocalyptic number.

It is an amenable number.

21155003003432 is a deficient number, since it is larger than the sum of its proper divisors (18517053385708).

21155003003432 is a wasteful number, since it uses less digits than its factorization.

21155003003432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428383852 (or 428383848 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 21155003003432 its reverse (23430030055112), we get a palindrome (44585033058544).

The spelling of 21155003003432 in words is "twenty-one trillion, one hundred fifty-five billion, three million, three thousand, four hundred thirty-two".