1020012003 has 12 divisors (see below), whose sum is σ = 1520878528. Its totient is φ = 658072080.

The previous prime is 1020011999. The next prime is 1020012013. The reversal of 1020012003 is 3002100201.

It is a happy number.

It is not a de Polignac number, because 1020012003 - 2² = 1020011999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020012013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1827700 + ... + 1828257.

Almost surely, 2^1020012003 is an apocalyptic number.

1020012003 is a deficient number, since it is larger than the sum of its proper divisors (500866525).

1020012003 is a wasteful number, since it uses less digits than its factorization.

1020012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3655994 (or 3655991 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1020012003 is about 31937.6267590439. The cubic root of 1020012003 is about 1006.6266580715.

Adding to 1020012003 its reverse (3002100201), we get a palindrome (4022112204).

The spelling of 1020012003 in words is "one billion, twenty million, twelve thousand, three".