1121011020 has 144 divisors (see below), whose sum is σ = 3592374240. Its totient is φ = 282175488.

The previous prime is 1121011013. The next prime is 1121011049. The reversal of 1121011020 is 201101211.

It is a happy number.

It is a super-2 number, since 2×1121011020² = 2513331413922880800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1121010993 and 1121011011.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1480482 + ... + 1481238.

Almost surely, 2^1121011020 is an apocalyptic number.

1121011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121011020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796187120).

1121011020 is an abundant number, since it is smaller than the sum of its proper divisors (2471363220).

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

1121011020 is a wasteful number, since it uses less digits than its factorization.

1121011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1121011020 is about 33481.5026544509. The cubic root of 1121011020 is about 1038.8112094503.

Adding to 1121011020 its reverse (201101211), we get a palindrome (1322112231).

The spelling of 1121011020 in words is "one billion, one hundred twenty-one million, eleven thousand, twenty".