21212003432 has 16 divisors (see below), whose sum is σ = 39789751200. Its totient is φ = 10601403120.

The previous prime is 21212003327. The next prime is 21212003441. The reversal of 21212003432 is 23430021212.

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 3 ways as a sum of consecutive naturals, for example, 555182 + ... + 592157.

It is an arithmetic number, because the mean of its divisors is an integer number (2486859450).

Almost surely, 2^21212003432 is an apocalyptic number.

It is an amenable number.

21212003432 is a deficient number, since it is larger than the sum of its proper divisors (18577747768).

21212003432 is a wasteful number, since it uses less digits than its factorization.

21212003432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149656 (or 1149652 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21212003432 its reverse (23430021212), we get a palindrome (44642024644).

The spelling of 21212003432 in words is "twenty-one billion, two hundred twelve million, three thousand, four hundred thirty-two".