1016111621 has 16 divisors (see below), whose sum is σ = 1226847360. Its totient is φ = 822104640.

The previous prime is 1016111581. The next prime is 1016111627. The reversal of 1016111621 is 1261116101.

It is a happy number.

It is not a de Polignac number, because 1016111621 - 2²² = 1011917317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1016111593 and 1016111602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016111627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23051 + ... + 50631.

It is an arithmetic number, because the mean of its divisors is an integer number (76677960).

Almost surely, 2^1016111621 is an apocalyptic number.

It is an amenable number.

1016111621 is a deficient number, since it is larger than the sum of its proper divisors (210735739).

1016111621 is a wasteful number, since it uses less digits than its factorization.

1016111621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27884.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 1016111621 is about 31876.5057840410. The cubic root of 1016111621 is about 1005.3419530574.

Adding to 1016111621 its reverse (1261116101), we get a palindrome (2277227722).

The spelling of 1016111621 in words is "one billion, sixteen million, one hundred eleven thousand, six hundred twenty-one".