221102112121220 has 36 divisors (see below), whose sum is σ = 510362148067212. Its totient is φ = 80400768043200.

The previous prime is 221102112121213. The next prime is 221102112121277. The reversal of 221102112121220 is 22121211201122.

It can be written as a sum of positive squares in 2 ways, for example, as 132535906355776 + 88566205765444 = 11512424^2 + 9410962^2 .

It is a super-2 number, since 2×221102112121220² (a number of 29 digits) contains 22 as substring.

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 = 221102112121192 and 221102112121201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45682252151 + ... + 45682256990.

Almost surely, 2^{221102112121220} is an apocalyptic number.

221102112121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221102112121220 is an abundant number, since it is smaller than the sum of its proper divisors (289260035945992).

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

221102112121220 is a wasteful number, since it uses less digits than its factorization.

221102112121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91364509172 (or 91364509159 counting only the distinct ones).

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

Adding to 221102112121220 its reverse (22121211201122), we get a palindrome (243223323322342).

The spelling of 221102112121220 in words is "two hundred twenty-one trillion, one hundred two billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty".