1021311103 has 4 divisors (see below), whose sum is σ = 1045062568. Its totient is φ = 997559640.

The previous prime is 1021311101. The next prime is 1021311119. The reversal of 1021311103 is 3011131201.

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 1021311103 - 2¹ = 1021311101 is a prime.

It is a super-2 number, since 2×1021311103² = 2086152738222153218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021311101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11875668 + ... + 11875753.

It is an arithmetic number, because the mean of its divisors is an integer number (261265642).

Almost surely, 2^1021311103 is an apocalyptic number.

1021311103 is a deficient number, since it is larger than the sum of its proper divisors (23751465).

1021311103 is an equidigital number, since it uses as much as digits as its factorization.

1021311103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23751464.

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

The square root of 1021311103 is about 31957.9583672049. The cubic root of 1021311103 is about 1007.0538275260.

Adding to 1021311103 its reverse (3011131201), we get a palindrome (4032442304).

It can be divided in two parts, 10213 and 11103, that added together give a square (21316 = 146²).

The spelling of 1021311103 in words is "one billion, twenty-one million, three hundred eleven thousand, one hundred three".