21232221234224 has 80 divisors (see below), whose sum is σ = 55233470664960. Its totient is φ = 7635963674880.

The previous prime is 21232221234181. The next prime is 21232221234239. The reversal of 21232221234224 is 42243212223212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 662828054 + ... + 662860085.

It is an arithmetic number, because the mean of its divisors is an integer number (690418383312).

Almost surely, 2^{21232221234224} is an apocalyptic number.

It is an amenable number.

21232221234224 is an abundant number, since it is smaller than the sum of its proper divisors (34001249430736).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232221234224 is a wasteful number, since it uses less digits than its factorization.

21232221234224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1325688178 (or 1325688172 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

Adding to 21232221234224 its reverse (42243212223212), we get a palindrome (63475433457436).

The spelling of 21232221234224 in words is "twenty-one trillion, two hundred thirty-two billion, two hundred twenty-one million, two hundred thirty-four thousand, two hundred twenty-four".