221112011211220 has 12 divisors (see below), whose sum is σ = 464335223543604. Its totient is φ = 88444804484480.

The previous prime is 221112011211211. The next prime is 221112011211307. The reversal of 221112011211220 is 22112110211122.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 69755436288784 + 151356574922436 = 8351972^2 + 12302706^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5527800280261 + ... + 5527800280300.

It is an arithmetic number, because the mean of its divisors is an integer number (38694601961967).

Almost surely, 2^{221112011211220} is an apocalyptic number.

221112011211220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112011211220 is an abundant number, since it is smaller than the sum of its proper divisors (243223212332384).

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

221112011211220 is a wasteful number, since it uses less digits than its factorization.

221112011211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11055600560570 (or 11055600560568 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221112011211220 its reverse (22112110211122), we get a palindrome (243224121422342).

The spelling of 221112011211220 in words is "two hundred twenty-one trillion, one hundred twelve billion, eleven million, two hundred eleven thousand, two hundred twenty".