612013021 has 4 divisors (see below), whose sum is σ = 613240000. Its totient is φ = 610786044.

The previous prime is 612013007. The next prime is 612013043. The reversal of 612013021 is 120310216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612013021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612012986 and 612013004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612013001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 612741 + ... + 613738.

It is an arithmetic number, because the mean of its divisors is an integer number (153310000).

Almost surely, 2^612013021 is an apocalyptic number.

It is an amenable number.

612013021 is a deficient number, since it is larger than the sum of its proper divisors (1226979).

612013021 is a wasteful number, since it uses less digits than its factorization.

612013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226978.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 612013021 is about 24738.8969236706. The cubic root of 612013021 is about 849.0244961146.

Adding to 612013021 its reverse (120310216), we get a palindrome (732323237).

The spelling of 612013021 in words is "six hundred twelve million, thirteen thousand, twenty-one".