1302123213121 has 4 divisors (see below), whose sum is σ = 1302963836500. Its totient is φ = 1301282589744.

The previous prime is 1302123213109. The next prime is 1302123213161. The reversal of 1302123213121 is 1213123212031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 926090576896 + 376032636225 = 962336^2 + 613215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1302123213121 - 2⁹ = 1302123212609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1302123213092 and 1302123213101.

It is not an unprimeable number, because it can be changed into a prime (1302123213161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 420309366 + ... + 420312463.

It is an arithmetic number, because the mean of its divisors is an integer number (325740959125).

Almost surely, 2^{1302123213121} is an apocalyptic number.

It is an amenable number.

1302123213121 is a deficient number, since it is larger than the sum of its proper divisors (840623379).

1302123213121 is an equidigital number, since it uses as much as digits as its factorization.

1302123213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840623378.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1302123213121 its reverse (1213123212031), we get a palindrome (2515246425152).

The spelling of 1302123213121 in words is "one trillion, three hundred two billion, one hundred twenty-three million, two hundred thirteen thousand, one hundred twenty-one".