103121220421 has 2 divisors, whose sum is σ = 103121220422. Its totient is φ = 103121220420.

The previous prime is 103121220413. The next prime is 103121220439. The reversal of 103121220421 is 124022121301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70825176900 + 32296043521 = 266130^2 + 179711^2 .

It is a cyclic number.

It is not a de Polignac number, because 103121220421 - 2³ = 103121220413 is a prime.

It is a super-2 number, since 2×103121220421² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103121220221) 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 as a sum of consecutive naturals, namely, 51560610210 + 51560610211.

It is an arithmetic number, because the mean of its divisors is an integer number (51560610211).

Almost surely, 2^103121220421 is an apocalyptic number.

It is an amenable number.

103121220421 is a deficient number, since it is larger than the sum of its proper divisors (1).

103121220421 is an equidigital number, since it uses as much as digits as its factorization.

103121220421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 103121220421 its reverse (124022121301), we get a palindrome (227143341722).

The spelling of 103121220421 in words is "one hundred three billion, one hundred twenty-one million, two hundred twenty thousand, four hundred twenty-one".