1121510220 has 48 divisors (see below), whose sum is σ = 3161050368. Its totient is φ = 297086400.

The previous prime is 1121510191. The next prime is 1121510233. The reversal of 1121510220 is 220151211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1121510220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52834 + ... + 70953.

It is an arithmetic number, because the mean of its divisors is an integer number (65855216).

Almost surely, 2^1121510220 is an apocalyptic number.

1121510220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121510220 is an abundant number, since it is smaller than the sum of its proper divisors (2039540148).

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

1121510220 is a wasteful number, since it uses less digits than its factorization.

1121510220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123950 (or 123948 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1121510220 is about 33488.9566872424. The cubic root of 1121510220 is about 1038.9653850381.

Adding to 1121510220 its reverse (220151211), we get a palindrome (1341661431).

The spelling of 1121510220 in words is "one billion, one hundred twenty-one million, five hundred ten thousand, two hundred twenty".