21212232032 has 24 divisors (see below), whose sum is σ = 41863714200. Its totient is φ = 10580177664.

The previous prime is 21212231993. The next prime is 21212232047. The reversal of 21212232032 is 23023221212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21212231995 and 21212232013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797282 + ... + 823457.

It is an arithmetic number, because the mean of its divisors is an integer number (1744321425).

Almost surely, 2^21212232032 is an apocalyptic number.

It is an amenable number.

21212232032 is a deficient number, since it is larger than the sum of its proper divisors (20651482168).

21212232032 is a wasteful number, since it uses less digits than its factorization.

21212232032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621158 (or 1621150 counting only the distinct ones).

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

Adding to 21212232032 its reverse (23023221212), we get a palindrome (44235453244).

The spelling of 21212232032 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-two thousand, thirty-two".