1211220201220 has 24 divisors (see below), whose sum is σ = 2568746213208. Its totient is φ = 479691168000.

The previous prime is 1211220201209. The next prime is 1211220201271. The reversal of 1211220201220 is 221020221121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 547682883136 + 663537318084 = 740056^2 + 814578^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1211220201194 and 1211220201203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 299804961 + ... + 299809000.

It is an arithmetic number, because the mean of its divisors is an integer number (107031092217).

Almost surely, 2^{1211220201220} is an apocalyptic number.

1211220201220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211220201220 is an abundant number, since it is smaller than the sum of its proper divisors (1357526011988).

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

1211220201220 is a wasteful number, since it uses less digits than its factorization.

1211220201220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599614071 (or 599614069 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1211220201220 its reverse (221020221121), we get a palindrome (1432240422341).

The spelling of 1211220201220 in words is "one trillion, two hundred eleven billion, two hundred twenty million, two hundred one thousand, two hundred twenty".