1003212121 has 4 divisors (see below), whose sum is σ = 1013554612. Its totient is φ = 992869632.

The previous prime is 1003212113. The next prime is 1003212151. The reversal of 1003212121 is 1212123001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 633226896 + 369985225 = 25164^2 + 19235^2 .

It is a cyclic number.

It is not a de Polignac number, because 1003212121 - 2³ = 1003212113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1003212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5171100 + ... + 5171293.

It is an arithmetic number, because the mean of its divisors is an integer number (253388653).

Almost surely, 2^1003212121 is an apocalyptic number.

It is an amenable number.

1003212121 is a deficient number, since it is larger than the sum of its proper divisors (10342491).

1003212121 is an equidigital number, since it uses as much as digits as its factorization.

1003212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10342490.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1003212121 is about 31673.5239750805. The cubic root of 1003212121 is about 1001.0695626279.

Adding to 1003212121 its reverse (1212123001), we get a palindrome (2215335122).

The spelling of 1003212121 in words is "one billion, three million, two hundred twelve thousand, one hundred twenty-one".