1211021110220 has 12 divisors (see below), whose sum is σ = 2543144331504. Its totient is φ = 484408444080.

The previous prime is 1211021110217. The next prime is 1211021110237. The reversal of 1211021110220 is 220111201121.

It is a junction number, because it is equal to n+sod(n) for n = 1211021110195 and 1211021110204.

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, 30275527736 + ... + 30275527775.

It is an arithmetic number, because the mean of its divisors is an integer number (211928694292).

Almost surely, 2^{1211021110220} is an apocalyptic number.

1211021110220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211021110220 is an abundant number, since it is smaller than the sum of its proper divisors (1332123221284).

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

1211021110220 is a wasteful number, since it uses less digits than its factorization.

1211021110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551055520 (or 60551055518 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1211021110220 its reverse (220111201121), we get a palindrome (1431132311341).

Subtracting from 1211021110220 its reverse (220111201121), we obtain a palindrome (990909909099).

The spelling of 1211021110220 in words is "one trillion, two hundred eleven billion, twenty-one million, one hundred ten thousand, two hundred twenty".