1220100211220 has 72 divisors (see below), whose sum is σ = 2981979586152. Its totient is φ = 417574389760.

The previous prime is 1220100211181. The next prime is 1220100211241. The reversal of 1220100211220 is 221120010221.

It can be written as a sum of positive squares in 4 ways, for example, as 163916477956 + 1056183733264 = 404866^2 + 1027708^2 .

It is a super-2 number, since 2×1220100211220² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220100211195 and 1220100211204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14787497 + ... + 14869776.

It is an arithmetic number, because the mean of its divisors is an integer number (41416383141).

Almost surely, 2^{1220100211220} is an apocalyptic number.

1220100211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220100211220 is an abundant number, since it is smaller than the sum of its proper divisors (1761879374932).

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

1220100211220 is a wasteful number, since it uses less digits than its factorization.

1220100211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29657321 (or 29657308 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1220100211220 its reverse (221120010221), we get a palindrome (1441220221441).

The spelling of 1220100211220 in words is "one trillion, two hundred twenty billion, one hundred million, two hundred eleven thousand, two hundred twenty".