21223220320320 has 112 divisors (see below), whose sum is σ = 67385225623488. Its totient is φ = 5659399342080.

The previous prime is 21223220320319. The next prime is 21223220320339. The reversal of 21223220320320 is 2302302232212.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 47737455 + ... + 48179985.

Almost surely, 2^{21223220320320} is an apocalyptic number.

21223220320320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223220320320 is an abundant number, since it is smaller than the sum of its proper divisors (46162005303168).

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

21223220320320 is a wasteful number, since it uses less digits than its factorization.

21223220320320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492508 (or 492498 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21223220320320 its reverse (2302302232212), we get a palindrome (23525522552532).

The spelling of 21223220320320 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred twenty million, three hundred twenty thousand, three hundred twenty".