2111216556 has 12 divisors (see below), whose sum is σ = 4926171992. Its totient is φ = 703738848.

The previous prime is 2111216539. The next prime is 2111216563. The reversal of 2111216556 is 6556121112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2111216556² = 8914470692657002272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87967345 + ... + 87967368.

Almost surely, 2^2111216556 is an apocalyptic number.

It is an amenable number.

2111216556 is an abundant number, since it is smaller than the sum of its proper divisors (2814955436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2111216556 is a wasteful number, since it uses less digits than its factorization.

2111216556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175934720 (or 175934718 counting only the distinct ones).

The product of its digits is 3600, while the sum is 30.

The square root of 2111216556 is about 45947.9766257449. The cubic root of 2111216556 is about 1282.8550682160.

Adding to 2111216556 its reverse (6556121112), we get a palindrome (8667337668).

The spelling of 2111216556 in words is "two billion, one hundred eleven million, two hundred sixteen thousand, five hundred fifty-six".