1040121243 has 20 divisors (see below), whose sum is σ = 1775728240. Its totient is φ = 594354672.

The previous prime is 1040121241. The next prime is 1040121253. The reversal of 1040121243 is 3421210401.

1040121243 is a `hidden beast` number, since 1 + 0 + 401 + 21 + 243 = 666.

It is not a de Polignac number, because 1040121243 - 2¹ = 1040121241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1040121241) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 916648 + ... + 917781.

It is an arithmetic number, because the mean of its divisors is an integer number (88786412).

Almost surely, 2^1040121243 is an apocalyptic number.

1040121243 is a deficient number, since it is larger than the sum of its proper divisors (735606997).

1040121243 is an equidigital number, since it uses as much as digits as its factorization.

1040121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834448 (or 1834439 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 1040121243 is about 32250.9107313266. The cubic root of 1040121243 is about 1013.1987735998.

Adding to 1040121243 its reverse (3421210401), we get a palindrome (4461331644).

The spelling of 1040121243 in words is "one billion, forty million, one hundred twenty-one thousand, two hundred forty-three".