1020103012021 has 4 divisors (see below), whose sum is σ = 1024335804844. Its totient is φ = 1015870219200.

The previous prime is 1020103012007. The next prime is 1020103012039. The reversal of 1020103012021 is 1202103010201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 797295411396 + 222807600625 = 892914^2 + 472025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020103012021 - 2⁵ = 1020103011989 is a prime.

It is a super-2 number, since 2×1020103012021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020103011992 and 1020103012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020103012001) 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, 2116396050 + ... + 2116396531.

It is an arithmetic number, because the mean of its divisors is an integer number (256083951211).

Almost surely, 2^{1020103012021} is an apocalyptic number.

It is an amenable number.

1020103012021 is a deficient number, since it is larger than the sum of its proper divisors (4232792823).

1020103012021 is an equidigital number, since it uses as much as digits as its factorization.

1020103012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232792822.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 1020103012021 its reverse (1202103010201), we get a palindrome (2222206022222).

The spelling of 1020103012021 in words is "one trillion, twenty billion, one hundred three million, twelve thousand, twenty-one".