10131222121 has 2 divisors, whose sum is σ = 10131222122. Its totient is φ = 10131222120.

The previous prime is 10131222109. The next prime is 10131222151. The reversal of 10131222121 is 12122213101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9280624896 + 850597225 = 96336^2 + 29165^2 .

It is a cyclic number.

It is not a de Polignac number, because 10131222121 - 2⁹ = 10131221609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10131222095 and 10131222104.

It is not a weakly prime, because it can be changed into another prime (10131222151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5065611060 + 5065611061.

It is an arithmetic number, because the mean of its divisors is an integer number (5065611061).

Almost surely, 2^10131222121 is an apocalyptic number.

It is an amenable number.

10131222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10131222121 is an equidigital number, since it uses as much as digits as its factorization.

10131222121 is an evil number, because the sum of its binary digits is even.

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

Adding to 10131222121 its reverse (12122213101), we get a palindrome (22253435222).

It can be divided in two parts, 10 and 131222121, that added together give a palindrome (131222131).

The spelling of 10131222121 in words is "ten billion, one hundred thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".