1013215121 has 4 divisors (see below), whose sum is σ = 1015742244. Its totient is φ = 1010688000.

The previous prime is 1013215097. The next prime is 1013215123. The reversal of 1013215121 is 1215123101.

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 956046400 + 57168721 = 30920^2 + 7561^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1013215121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1013215121.

It is not an unprimeable number, because it can be changed into a prime (1013215123) 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, 1262960 + ... + 1263761.

It is an arithmetic number, because the mean of its divisors is an integer number (253935561).

Almost surely, 2^1013215121 is an apocalyptic number.

It is an amenable number.

1013215121 is a deficient number, since it is larger than the sum of its proper divisors (2527123).

1013215121 is an equidigital number, since it uses as much as digits as its factorization.

1013215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2527122.

The product of its (nonzero) digits is 60, while the sum is 17.

The square root of 1013215121 is about 31831.0402123462. The cubic root of 1013215121 is about 1004.3857771717.

Adding to 1013215121 its reverse (1215123101), we get a palindrome (2228338222).

The spelling of 1013215121 in words is "one billion, thirteen million, two hundred fifteen thousand, one hundred twenty-one".