1210121303213 has 4 divisors (see below), whose sum is σ = 1211320631580. Its totient is φ = 1208921974848.

The previous prime is 1210121303197. The next prime is 1210121303219. The reversal of 1210121303213 is 3123031210121.

It is a happy number.

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 358271679364 + 851849623849 = 598558^2 + 922957^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210121303213 - 2⁴ = 1210121303197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210121303219) 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, 599662670 + ... + 599664687.

It is an arithmetic number, because the mean of its divisors is an integer number (302830157895).

Almost surely, 2^{1210121303213} is an apocalyptic number.

It is an amenable number.

1210121303213 is a deficient number, since it is larger than the sum of its proper divisors (1199328367).

1210121303213 is a wasteful number, since it uses less digits than its factorization.

1210121303213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199328366.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1210121303213 its reverse (3123031210121), we get a palindrome (4333152513334).

The spelling of 1210121303213 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, three hundred three thousand, two hundred thirteen".