103312121021 has 2 divisors, whose sum is σ = 103312121022. Its totient is φ = 103312121020.

The previous prime is 103312121009. The next prime is 103312121111. The reversal of 103312121021 is 120121213301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75619500100 + 27692620921 = 274990^2 + 166411^2 .

It is a cyclic number.

It is not a de Polignac number, because 103312121021 - 2¹⁰ = 103312119997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (103312121321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51656060510 + 51656060511.

It is an arithmetic number, because the mean of its divisors is an integer number (51656060511).

Almost surely, 2^103312121021 is an apocalyptic number.

It is an amenable number.

103312121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

103312121021 is an equidigital number, since it uses as much as digits as its factorization.

103312121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 103312121021 its reverse (120121213301), we get a palindrome (223433334322).

The spelling of 103312121021 in words is "one hundred three billion, three hundred twelve million, one hundred twenty-one thousand, twenty-one".