221011211212220 has 96 divisors (see below), whose sum is σ = 546374544016896. Its totient is φ = 74034490118400.

The previous prime is 221011211212219. The next prime is 221011211212289. The reversal of 221011211212220 is 22212112110122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221011211212192 and 221011211212201.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 77288864 + ... + 80097383.

It is an arithmetic number, because the mean of its divisors is an integer number (5691401500176).

Almost surely, 2^{221011211212220} is an apocalyptic number.

221011211212220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221011211212220 is an abundant number, since it is smaller than the sum of its proper divisors (325363332804676).

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

221011211212220 is a wasteful number, since it uses less digits than its factorization.

221011211212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157386771 (or 157386769 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221011211212220 its reverse (22212112110122), we get a palindrome (243223323322342).

The spelling of 221011211212220 in words is "two hundred twenty-one trillion, eleven billion, two hundred eleven million, two hundred twelve thousand, two hundred twenty".