1021240203 has 4 divisors (see below), whose sum is σ = 1361653608. Its totient is φ = 680826800.

The previous prime is 1021240193. The next prime is 1021240247. The reversal of 1021240203 is 3020421201.

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

It is a cyclic number.

It is not a de Polignac number, because 1021240203 - 2¹⁶ = 1021174667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021240403) 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, 170206698 + ... + 170206703.

It is an arithmetic number, because the mean of its divisors is an integer number (340413402).

Almost surely, 2^1021240203 is an apocalyptic number.

1021240203 is a deficient number, since it is larger than the sum of its proper divisors (340413405).

1021240203 is an equidigital number, since it uses as much as digits as its factorization.

1021240203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340413404.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 1021240203 is about 31956.8490780928. The cubic root of 1021240203 is about 1007.0305235695.

Adding to 1021240203 its reverse (3020421201), we get a palindrome (4041661404).

The spelling of 1021240203 in words is "one billion, twenty-one million, two hundred forty thousand, two hundred three".