103121210020021 has 2 divisors, whose sum is σ = 103121210020022. Its totient is φ = 103121210020020.

The previous prime is 103121210019991. The next prime is 103121210020067. The reversal of 103121210020021 is 120020012121301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103108061957796 + 13148062225 = 10154214^2 + 114665^2 .

It is an emirp because it is prime and its reverse (120020012121301) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 103121210020021 - 2³³ = 103112620085429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 103121210019977 and 103121210020004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103121210020091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51560605010010 + 51560605010011.

It is an arithmetic number, because the mean of its divisors is an integer number (51560605010011).

Almost surely, 2^{103121210020021} is an apocalyptic number.

It is an amenable number.

103121210020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103121210020021 is an equidigital number, since it uses as much as digits as its factorization.

103121210020021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 103121210020021 its reverse (120020012121301), we get a palindrome (223141222141322).

The spelling of 103121210020021 in words is "one hundred three trillion, one hundred twenty-one billion, two hundred ten million, twenty thousand, twenty-one".