221000212021220 has 48 divisors (see below), whose sum is σ = 488533146144960. Its totient is φ = 83746358193024.

The previous prime is 221000212021217. The next prime is 221000212021231. The reversal of 221000212021220 is 22120212000122.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25735142 + ... + 33230978.

It is an arithmetic number, because the mean of its divisors is an integer number (10177773878020).

Almost surely, 2^{221000212021220} is an apocalyptic number.

221000212021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000212021220 is an abundant number, since it is smaller than the sum of its proper divisors (267532934123740).

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

221000212021220 is a wasteful number, since it uses less digits than its factorization.

221000212021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7573452 (or 7573450 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221000212021220 its reverse (22120212000122), we get a palindrome (243120424021342).

The spelling of 221000212021220 in words is "two hundred twenty-one trillion, two hundred twelve million, twenty-one thousand, two hundred twenty".