1210011220 has 48 divisors (see below), whose sum is σ = 2861462016. Its totient is φ = 425808000.

The previous prime is 1210011217. The next prime is 1210011221. The reversal of 1210011220 is 221100121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1210011197 and 1210011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210011221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81891 + ... + 95530.

It is an arithmetic number, because the mean of its divisors is an integer number (59613792).

Almost surely, 2^1210011220 is an apocalyptic number.

1210011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210011220 is an abundant number, since it is smaller than the sum of its proper divisors (1651450796).

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

1210011220 is a wasteful number, since it uses less digits than its factorization.

1210011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177472 (or 177470 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1210011220 is about 34785.2155376390. The cubic root of 1210011220 is about 1065.6055304361.

Adding to 1210011220 its reverse (221100121), we get a palindrome (1431111341).

It can be divided in two parts, 121001 and 1220, that added together give a palindrome (122221).

The spelling of 1210011220 in words is "one billion, two hundred ten million, eleven thousand, two hundred twenty".