1013612021 has 4 divisors (see below), whose sum is σ = 1016090700. Its totient is φ = 1011133344.

The previous prime is 1013612009. The next prime is 1013612059. The reversal of 1013612021 is 1202163101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1202163101 = 1151 ⋅1044451.

It can be written as a sum of positive squares in 2 ways, for example, as 737719921 + 275892100 = 27161^2 + 16610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1013612021 is a prime.

It is a super-3 number, since 3×1013612021³ (a number of 28 digits) contains 333 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 (1013612071) 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, 1238726 + ... + 1239543.

It is an arithmetic number, because the mean of its divisors is an integer number (254022675).

Almost surely, 2^1013612021 is an apocalyptic number.

It is an amenable number.

1013612021 is a deficient number, since it is larger than the sum of its proper divisors (2478679).

1013612021 is an equidigital number, since it uses as much as digits as its factorization.

1013612021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478678.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1013612021 is about 31837.2740824336. The cubic root of 1013612021 is about 1004.5169071643.

Adding to 1013612021 its reverse (1202163101), we get a palindrome (2215775122).

The spelling of 1013612021 in words is "one billion, thirteen million, six hundred twelve thousand, twenty-one".