1012016721 has 8 divisors (see below), whose sum is σ = 1408023360. Its totient is φ = 645343952.

The previous prime is 1012016717. The next prime is 1012016743. The reversal of 1012016721 is 1276102101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1012016721 - 2² = 1012016717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1012014721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7333386 + ... + 7333523.

It is an arithmetic number, because the mean of its divisors is an integer number (176002920).

Almost surely, 2^1012016721 is an apocalyptic number.

It is an amenable number.

1012016721 is a deficient number, since it is larger than the sum of its proper divisors (396006639).

1012016721 is a wasteful number, since it uses less digits than its factorization.

1012016721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14666935.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 1012016721 is about 31812.2102501539. The cubic root of 1012016721 is about 1003.9896353088.

Adding to 1012016721 its reverse (1276102101), we get a palindrome (2288118822).

The spelling of 1012016721 in words is "one billion, twelve million, sixteen thousand, seven hundred twenty-one".