1012103021 has 4 divisors (see below), whose sum is σ = 1012166652. Its totient is φ = 1012039392.

The previous prime is 1012102991. The next prime is 1012103047. The reversal of 1012103021 is 1203012101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6325225 + 1005777796 = 2515^2 + 31714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012103021 - 2⁶ = 1012102957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1012102993 and 1012103011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012105021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15455 + ... + 47571.

It is an arithmetic number, because the mean of its divisors is an integer number (253041663).

Almost surely, 2^1012103021 is an apocalyptic number.

It is an amenable number.

1012103021 is a deficient number, since it is larger than the sum of its proper divisors (63631).

1012103021 is an equidigital number, since it uses as much as digits as its factorization.

1012103021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63630.

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

The square root of 1012103021 is about 31813.5666186613. The cubic root of 1012103021 is about 1004.0181729937.

Adding to 1012103021 its reverse (1203012101), we get a palindrome (2215115122).

The spelling of 1012103021 in words is "one billion, twelve million, one hundred three thousand, twenty-one".