21222321232400 has 240 divisors, whose sum is σ = 56890845859968. Its totient is φ = 7566535680000.

The previous prime is 21222321232381. The next prime is 21222321232433. The reversal of 21222321232400 is 423212322212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222321232400.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15124655 + ... + 16468145.

Almost surely, 2^{21222321232400} is an apocalyptic number.

21222321232400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222321232400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28445422929984).

21222321232400 is an abundant number, since it is smaller than the sum of its proper divisors (35668524627568).

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

21222321232400 is a wasteful number, since it uses less digits than its factorization.

21222321232400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343650 (or 1343639 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21222321232400 its reverse (423212322212), we get a palindrome (21645533554612).

The spelling of 21222321232400 in words is "twenty-one trillion, two hundred twenty-two billion, three hundred twenty-one million, two hundred thirty-two thousand, four hundred".