1013213121 has 16 divisors (see below), whose sum is σ = 1368601920. Its totient is φ = 666666560.

The previous prime is 1013213119. The next prime is 1013213161. The reversal of 1013213121 is 1213123101.

It is a happy number.

1013213121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1013213121 - 2¹ = 1013213119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1013213121.

It is not an unprimeable number, because it can be changed into a prime (1013213101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 424351 + ... + 426731.

It is an arithmetic number, because the mean of its divisors is an integer number (85537620).

Almost surely, 2^1013213121 is an apocalyptic number.

It is an amenable number.

1013213121 is a deficient number, since it is larger than the sum of its proper divisors (355388799).

1013213121 is a wasteful number, since it uses less digits than its factorization.

1013213121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 1013213121 is about 31831.0087964551. The cubic root of 1013213121 is about 1004.3851163141.

Adding to 1013213121 its reverse (1213123101), we get a palindrome (2226336222).

The spelling of 1013213121 in words is "one billion, thirteen million, two hundred thirteen thousand, one hundred twenty-one".