2013210121 has 4 divisors (see below), whose sum is σ = 2168072452. Its totient is φ = 1858347792.

The previous prime is 2013210119. The next prime is 2013210127. The reversal of 2013210121 is 1210123102.

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 89510521 + 1923699600 = 9461^2 + 43860^2 .

It is a cyclic number.

It is not a de Polignac number, because 2013210121 - 2¹ = 2013210119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 154862317 = 2013210121 / (2 + 0 + 1 + 3 + 2 + 1 + 0 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (2013210127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77431146 + ... + 77431171.

It is an arithmetic number, because the mean of its divisors is an integer number (542018113).

Almost surely, 2^2013210121 is an apocalyptic number.

It is an amenable number.

2013210121 is a deficient number, since it is larger than the sum of its proper divisors (154862331).

2013210121 is a wasteful number, since it uses less digits than its factorization.

2013210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154862330.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2013210121 is about 44868.8101134853. The cubic root of 2013210121 is about 1262.6889164214.

Adding to 2013210121 its reverse (1210123102), we get a palindrome (3223333223).

The spelling of 2013210121 in words is "two billion, thirteen million, two hundred ten thousand, one hundred twenty-one".