2112111551 has 16 divisors (see below), whose sum is σ = 2440205568. Its totient is φ = 1809192000.

The previous prime is 2112111527. The next prime is 2112111563. The reversal of 2112111551 is 1551112112.

It is not a de Polignac number, because 2112111551 - 2³⁰ = 1038369727 is a prime.

It is a super-2 number, since 2×2112111551² = 8922030407735251202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112111751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45350 + ... + 79251.

It is an arithmetic number, because the mean of its divisors is an integer number (152512848).

Almost surely, 2^2112111551 is an apocalyptic number.

2112111551 is a deficient number, since it is larger than the sum of its proper divisors (328094017).

2112111551 is a wasteful number, since it uses less digits than its factorization.

2112111551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124702.

The product of its digits is 100, while the sum is 20.

The square root of 2112111551 is about 45957.7148148165. The cubic root of 2112111551 is about 1283.0363202157.

Adding to 2112111551 its reverse (1551112112), we get a palindrome (3663223663).

The spelling of 2112111551 in words is "two billion, one hundred twelve million, one hundred eleven thousand, five hundred fifty-one".