2021516071556 has 12 divisors (see below), whose sum is σ = 3537686581968. Its totient is φ = 1010748476712.

The previous prime is 2021516071543. The next prime is 2021516071559. The reversal of 2021516071556 is 6551706151202.

It is a super-2 number, since 2×2021516071556² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2021516071559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1902926 + ... + 2768421.

It is an arithmetic number, because the mean of its divisors is an integer number (294807215164).

Almost surely, 2^{2021516071556} is an apocalyptic number.

It is an amenable number.

2021516071556 is a deficient number, since it is larger than the sum of its proper divisors (1516170510412).

2021516071556 is a wasteful number, since it uses less digits than its factorization.

2021516071556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779538 (or 4779536 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 2021516071556 in words is "two trillion, twenty-one billion, five hundred sixteen million, seventy-one thousand, five hundred fifty-six".