21210132224 has 36 divisors (see below), whose sum is σ = 42413707224. Its totient is φ = 10585955328.

The previous prime is 21210132217. The next prime is 21210132239. The reversal of 21210132224 is 42223101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210132196 and 21210132205.

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, 68219 + ... + 216965.

It is an arithmetic number, because the mean of its divisors is an integer number (1178158534).

Almost surely, 2^21210132224 is an apocalyptic number.

It is an amenable number.

21210132224 is a deficient number, since it is larger than the sum of its proper divisors (21203575000).

21210132224 is an equidigital number, since it uses as much as digits as its factorization.

21210132224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149320 (or 149306 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21210132224 its reverse (42223101212), we get a palindrome (63433233436).

The spelling of 21210132224 in words is "twenty-one billion, two hundred ten million, one hundred thirty-two thousand, two hundred twenty-four".