2111261556 has 12 divisors (see below), whose sum is σ = 4926276992. Its totient is φ = 703753848.

The previous prime is 2111261549. The next prime is 2111261557. The reversal of 2111261556 is 6551621112.

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

It is a super-2 number, since 2×2111261556² = 8914850715687082272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111261557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87969220 + ... + 87969243.

Almost surely, 2^2111261556 is an apocalyptic number.

It is an amenable number.

2111261556 is an abundant number, since it is smaller than the sum of its proper divisors (2815015436).

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

2111261556 is a wasteful number, since it uses less digits than its factorization.

2111261556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175938470 (or 175938468 counting only the distinct ones).

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

The square root of 2111261556 is about 45948.4663073753. The cubic root of 2111261556 is about 1282.8641827189.

Adding to 2111261556 its reverse (6551621112), we get a palindrome (8662882668).

The spelling of 2111261556 in words is "two billion, one hundred eleven million, two hundred sixty-one thousand, five hundred fifty-six".