1021116556 has 24 divisors (see below), whose sum is σ = 1866461184. Its totient is φ = 487885200.

The previous prime is 1021116517. The next prime is 1021116617. The reversal of 1021116556 is 6556111201.

It is a happy number.

It is a super-2 number, since 2×1021116556² = 2085358041874602272, which contains 22 as substring.

It is an unprimeable number.

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, 101071 + ... + 110713.

It is an arithmetic number, because the mean of its divisors is an integer number (77769216).

Almost surely, 2^1021116556 is an apocalyptic number.

It is an amenable number.

1021116556 is a deficient number, since it is larger than the sum of its proper divisors (845344628).

1021116556 is a wasteful number, since it uses less digits than its factorization.

1021116556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10821 (or 10819 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 1021116556 is about 31954.9144264227. The cubic root of 1021116556 is about 1006.9898797430.

Adding to 1021116556 its reverse (6556111201), we get a palindrome (7577227757).

The spelling of 1021116556 in words is "one billion, twenty-one million, one hundred sixteen thousand, five hundred fifty-six".