1021012001003 has 4 divisors (see below), whose sum is σ = 1074749474760. Its totient is φ = 967274527248.

The previous prime is 1021012000999. The next prime is 1021012001017. The reversal of 1021012001003 is 3001002101201.

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 1021012001003 - 2² = 1021012000999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021012001903) 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, 26868736850 + ... + 26868736887.

It is an arithmetic number, because the mean of its divisors is an integer number (268687368690).

Almost surely, 2^{1021012001003} is an apocalyptic number.

1021012001003 is a deficient number, since it is larger than the sum of its proper divisors (53737473757).

1021012001003 is an equidigital number, since it uses as much as digits as its factorization.

1021012001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53737473756.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 1021012001003 its reverse (3001002101201), we get a palindrome (4022014102204).

The spelling of 1021012001003 in words is "one trillion, twenty-one billion, twelve million, one thousand, three".