2145021211213 has 8 divisors (see below), whose sum is σ = 2204023794840. Its totient is φ = 2086072787520.

The previous prime is 2145021211129. The next prime is 2145021211231. The reversal of 2145021211213 is 3121121205412.

It can be written as a sum of positive squares in 4 ways, for example, as 1592194759684 + 552826451529 = 1261822^2 + 743523^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2145021211213 - 2¹³ = 2145021203021 is a prime.

It is a super-2 number, since 2×2145021211213² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145021211513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13459678 + ... + 13618111.

It is an arithmetic number, because the mean of its divisors is an integer number (275502974355).

Almost surely, 2^{2145021211213} is an apocalyptic number.

It is an amenable number.

2145021211213 is a deficient number, since it is larger than the sum of its proper divisors (59002583627).

2145021211213 is a wasteful number, since it uses less digits than its factorization.

2145021211213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27079967.

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 2145021211213 its reverse (3121121205412), we get a palindrome (5266142416625).

The spelling of 2145021211213 in words is "two trillion, one hundred forty-five billion, twenty-one million, two hundred eleven thousand, two hundred thirteen".