1002011121 has 8 divisors (see below), whose sum is σ = 1484460960. Its totient is φ = 668007396.

The previous prime is 1002011119. The next prime is 1002011149. The reversal of 1002011121 is 1211102001.

It is a happy number.

It is not a de Polignac number, because 1002011121 - 2¹ = 1002011119 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1002011221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18555735 + ... + 18555788.

It is an arithmetic number, because the mean of its divisors is an integer number (185557620).

Almost surely, 2^1002011121 is an apocalyptic number.

It is an amenable number.

1002011121 is a deficient number, since it is larger than the sum of its proper divisors (482449839).

1002011121 is an equidigital number, since it uses as much as digits as its factorization.

1002011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37111532 (or 37111526 counting only the distinct ones).

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

The square root of 1002011121 is about 31654.5592450756. The cubic root of 1002011121 is about 1000.6699247673.

Adding to 1002011121 its reverse (1211102001), we get a palindrome (2213113122).

The spelling of 1002011121 in words is "one billion, two million, eleven thousand, one hundred twenty-one".