221020220211220 has 24 divisors (see below), whose sum is σ = 464411842935264. Its totient is φ = 88356777514656.

The previous prime is 221020220211187. The next prime is 221020220211223. The reversal of 221020220211220 is 22112022020122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020220211223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3206875294 + ... + 3206944213.

It is an arithmetic number, because the mean of its divisors is an integer number (19350493455636).

Almost surely, 2^{221020220211220} is an apocalyptic number.

221020220211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221020220211220 is an abundant number, since it is smaller than the sum of its proper divisors (243391622724044).

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

221020220211220 is a wasteful number, since it uses less digits than its factorization.

221020220211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6413821239 (or 6413821237 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221020220211220 its reverse (22112022020122), we get a palindrome (243132242231342).

The spelling of 221020220211220 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty".