221211020222220 has 72 divisors (see below), whose sum is σ = 720515894447664. Its totient is φ = 50562518907264.

The previous prime is 221211020222209. The next prime is 221211020222221. The reversal of 221211020222220 is 22222020112122.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (221211020222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37620918867 + ... + 37620924746.

It is an arithmetic number, because the mean of its divisors is an integer number (10007165200662).

Almost surely, 2^{221211020222220} is an apocalyptic number.

221211020222220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221211020222220 is an abundant number, since it is smaller than the sum of its proper divisors (499304874225444).

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

221211020222220 is a wasteful number, since it uses less digits than its factorization.

221211020222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75241843639 (or 75241843630 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 221211020222220 its reverse (22222020112122), we get a palindrome (243433040334342).

The spelling of 221211020222220 in words is "two hundred twenty-one trillion, two hundred eleven billion, twenty million, two hundred twenty-two thousand, two hundred twenty".