1121210220 has 72 divisors (see below), whose sum is σ = 3399487056. Its totient is φ = 275987712.

The previous prime is 1121210219. The next prime is 1121210243. The reversal of 1121210220 is 220121211.

It is a super-2 number, since 2×1121210220² = 2514224714864896800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1121210196 and 1121210205.

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, 45147 + ... + 65426.

It is an arithmetic number, because the mean of its divisors is an integer number (47215098).

Almost surely, 2^1121210220 is an apocalyptic number.

1121210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121210220 is an abundant number, since it is smaller than the sum of its proper divisors (2278276836).

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

1121210220 is a wasteful number, since it uses less digits than its factorization.

1121210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110611 (or 110596 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1121210220 is about 33484.4772991904. The cubic root of 1121210220 is about 1038.8727369267.

Adding to 1121210220 its reverse (220121211), we get a palindrome (1341331431).

The spelling of 1121210220 in words is "one billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty".