1211012003 has 4 divisors (see below), whose sum is σ = 1211251368. Its totient is φ = 1210772640.

The previous prime is 1211011951. The next prime is 1211012021. The reversal of 1211012003 is 3002101121.

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 1211012003 - 2¹² = 1211007907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211012083) 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, 111926 + ... + 122267.

It is an arithmetic number, because the mean of its divisors is an integer number (302812842).

Almost surely, 2^1211012003 is an apocalyptic number.

1211012003 is a deficient number, since it is larger than the sum of its proper divisors (239365).

1211012003 is an equidigital number, since it uses as much as digits as its factorization.

1211012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239364.

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

The square root of 1211012003 is about 34799.5977419280. The cubic root of 1211012003 is about 1065.8992318510.

Adding to 1211012003 its reverse (3002101121), we get a palindrome (4213113124).

The spelling of 1211012003 in words is "one billion, two hundred eleven million, twelve thousand, three".