1005412121 has 4 divisors (see below), whose sum is σ = 1149042432. Its totient is φ = 861781812.

The previous prime is 1005412073. The next prime is 1005412139. The reversal of 1005412121 is 1212145001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1212145001 = 1277 ⋅949213.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005412121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1005412121.

It is not an unprimeable number, because it can be changed into a prime (1005412171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71815145 + ... + 71815158.

It is an arithmetic number, because the mean of its divisors is an integer number (287260608).

Almost surely, 2^1005412121 is an apocalyptic number.

It is an amenable number.

1005412121 is a deficient number, since it is larger than the sum of its proper divisors (143630311).

1005412121 is an equidigital number, since it uses as much as digits as its factorization.

1005412121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143630310.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 1005412121 is about 31708.2342775501. The cubic root of 1005412121 is about 1001.8007955222.

Adding to 1005412121 its reverse (1212145001), we get a palindrome (2217557122).

The spelling of 1005412121 in words is "one billion, five million, four hundred twelve thousand, one hundred twenty-one".