2211812505 has 24 divisors (see below), whose sum is σ = 4381495872. Its totient is φ = 1011114144.

The previous prime is 2211812461. The next prime is 2211812563. The reversal of 2211812505 is 5052181122.

It is a happy number.

It is not a de Polignac number, because 2211812505 - 2¹⁶ = 2211746969 is a prime.

It is a super-2 number, since 2×2211812505² = 9784229114548750050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3510499 + ... + 3511128.

It is an arithmetic number, because the mean of its divisors is an integer number (182562328).

Almost surely, 2^2211812505 is an apocalyptic number.

It is an amenable number.

2211812505 is a deficient number, since it is larger than the sum of its proper divisors (2169683367).

2211812505 is a wasteful number, since it uses less digits than its factorization.

2211812505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021645 (or 7021642 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 2211812505 is about 47029.9107483737. The cubic root of 2211812505 is about 1302.9150571503.

Adding to 2211812505 its reverse (5052181122), we get a palindrome (7263993627).

The spelling of 2211812505 in words is "two billion, two hundred eleven million, eight hundred twelve thousand, five hundred five".