1211320220 has 24 divisors (see below), whose sum is σ = 2775025008. Its totient is φ = 440480000.

The previous prime is 1211320217. The next prime is 1211320241. The reversal of 1211320220 is 220231121.

It is a happy number.

1211320220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 1211320195 and 1211320204.

It is a congruent number.

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, 2752781 + ... + 2753220.

It is an arithmetic number, because the mean of its divisors is an integer number (115626042).

Almost surely, 2^1211320220 is an apocalyptic number.

1211320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211320220 is an abundant number, since it is smaller than the sum of its proper divisors (1563704788).

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

1211320220 is a wasteful number, since it uses less digits than its factorization.

1211320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5506021 (or 5506019 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1211320220 is about 34804.0259165517. The cubic root of 1211320220 is about 1065.9896522033.

Adding to 1211320220 its reverse (220231121), we get a palindrome (1431551341).

The spelling of 1211320220 in words is "one billion, two hundred eleven million, three hundred twenty thousand, two hundred twenty".