1310212121 has 8 divisors (see below), whose sum is σ = 1318526664. Its totient is φ = 1301909760.

The previous prime is 1310212087. The next prime is 1310212129. The reversal of 1310212121 is 1212120131.

It can be written as a sum of positive squares in 4 ways, for example, as 98406400 + 1211805721 = 9920^2 + 34811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1310212121 is a prime.

It is a super-3 number, since 3×1310212121³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1310212096 and 1310212105.

It is not an unprimeable number, because it can be changed into a prime (1310212129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311585 + ... + 315761.

It is an arithmetic number, because the mean of its divisors is an integer number (164815833).

Almost surely, 2^1310212121 is an apocalyptic number.

It is an amenable number.

1310212121 is a deficient number, since it is larger than the sum of its proper divisors (8314543).

1310212121 is a wasteful number, since it uses less digits than its factorization.

1310212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6091.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1310212121 is about 36196.8523631545. The cubic root of 1310212121 is about 1094.2432365585.

Adding to 1310212121 its reverse (1212120131), we get a palindrome (2522332252).

The spelling of 1310212121 in words is "one billion, three hundred ten million, two hundred twelve thousand, one hundred twenty-one".