21021212032 has 16 divisors (see below), whose sum is σ = 41878196100. Its totient is φ = 10510605952.

The previous prime is 21021211987. The next prime is 21021212041. The reversal of 21021212032 is 23021212012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21021211997 and 21021212015.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 82113982 + ... + 82114237.

Almost surely, 2^21021212032 is an apocalyptic number.

It is an amenable number.

21021212032 is a deficient number, since it is larger than the sum of its proper divisors (20856984068).

21021212032 is an equidigital number, since it uses as much as digits as its factorization.

21021212032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164228233 (or 164228221 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21021212032 its reverse (23021212012), we get a palindrome (44042424044).

The spelling of 21021212032 in words is "twenty-one billion, twenty-one million, two hundred twelve thousand, thirty-two".