1021220003 has 4 divisors (see below), whose sum is σ = 1021556688. Its totient is φ = 1020883320.

The previous prime is 1021219957. The next prime is 1021220021. The reversal of 1021220003 is 3000221201.

It is a happy number.

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 1021220003 - 2¹⁴ = 1021203619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021220503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163751 + ... + 169872.

It is an arithmetic number, because the mean of its divisors is an integer number (255389172).

Almost surely, 2^1021220003 is an apocalyptic number.

1021220003 is a deficient number, since it is larger than the sum of its proper divisors (336685).

1021220003 is an equidigital number, since it uses as much as digits as its factorization.

1021220003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336684.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1021220003 is about 31956.5330253455. The cubic root of 1021220003 is about 1007.0238838809.

Adding to 1021220003 its reverse (3000221201), we get a palindrome (4021441204).

The spelling of 1021220003 in words is "one billion, twenty-one million, two hundred twenty thousand, three".