1213111003 has 16 divisors (see below), whose sum is σ = 1362516736. Its totient is φ = 1072465920.

The previous prime is 1213110989. The next prime is 1213111021. The reversal of 1213111003 is 3001113121.

It is a cyclic number.

It is not a de Polignac number, because 1213111003 - 2²¹ = 1211013851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213111033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23575 + ... + 54607.

It is an arithmetic number, because the mean of its divisors is an integer number (85157296).

Almost surely, 2^1213111003 is an apocalyptic number.

1213111003 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213111003 is a deficient number, since it is larger than the sum of its proper divisors (149405733).

1213111003 is a wasteful number, since it uses less digits than its factorization.

1213111003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31174.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1213111003 is about 34829.7430797300. The cubic root of 1213111003 is about 1066.5147036228.

Adding to 1213111003 its reverse (3001113121), we get a palindrome (4214224124).

The spelling of 1213111003 in words is "one billion, two hundred thirteen million, one hundred eleven thousand, three".