1001021120 has 112 divisors (see below), whose sum is σ = 2625242400. Its totient is φ = 360529920.

The previous prime is 1001021117. The next prime is 1001021141. The reversal of 1001021120 is 211201001.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 1001021098 and 1001021107.

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, 382376 + ... + 384984.

Almost surely, 2^1001021120 is an apocalyptic number.

1001021120 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 1001021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1312621200).

1001021120 is an abundant number, since it is smaller than the sum of its proper divisors (1624221280).

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

1001021120 is a wasteful number, since it uses less digits than its factorization.

1001021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2746 (or 2736 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1001021120 is about 31638.9178070300. The cubic root of 1001021120 is about 1000.3402575450.

Adding to 1001021120 its reverse (211201001), we get a palindrome (1212222121).

The spelling of 1001021120 in words is "one billion, one million, twenty-one thousand, one hundred twenty".