2013121221 has 8 divisors (see below), whose sum is σ = 2684934240. Its totient is φ = 1341694512.

The previous prime is 2013121211. The next prime is 2013121237. The reversal of 2013121221 is 1221213102.

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

It is not a de Polignac number, because 2013121221 - 2²⁵ = 1979566789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2013121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2013121211) 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, 84190 + ... + 105423.

It is an arithmetic number, because the mean of its divisors is an integer number (335616780).

Almost surely, 2^2013121221 is an apocalyptic number.

It is an amenable number.

2013121221 is a deficient number, since it is larger than the sum of its proper divisors (671813019).

2013121221 is a wasteful number, since it uses less digits than its factorization.

2013121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193155.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2013121221 is about 44867.8194366519. The cubic root of 2013121221 is about 1262.6703300693.

Adding to 2013121221 its reverse (1221213102), we get a palindrome (3234334323).

The spelling of 2013121221 in words is "two billion, thirteen million, one hundred twenty-one thousand, two hundred twenty-one".