103105056021 has 12 divisors (see below), whose sum is σ = 151107134976. Its totient is φ = 62487912520.

The previous prime is 103105056017. The next prime is 103105056023. The reversal of 103105056021 is 120650501301.

It is not a de Polignac number, because 103105056021 - 2² = 103105056017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 103105055982 and 103105056000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103105056023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142017621 + ... + 142018346.

It is an arithmetic number, because the mean of its divisors is an integer number (12592261248).

Almost surely, 2^103105056021 is an apocalyptic number.

103105056021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

103105056021 is a deficient number, since it is larger than the sum of its proper divisors (48002078955).

103105056021 is a wasteful number, since it uses less digits than its factorization.

103105056021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284035992 (or 284035981 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

Adding to 103105056021 its reverse (120650501301), we get a palindrome (223755557322).

The spelling of 103105056021 in words is "one hundred three billion, one hundred five million, fifty-six thousand, twenty-one".