2211215481 has 6 divisors (see below), whose sum is σ = 3193977930. Its totient is φ = 1474143648.

The previous prime is 2211215467. The next prime is 2211215509. The reversal of 2211215481 is 1845121122.

2211215481 is a `hidden beast` number, since 2 + 2 + 112 + 1 + 548 + 1 = 666.

2211215481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1112889600 + 1098325881 = 33360^2 + 33141^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2211215481 is a prime.

It is a super-2 number, since 2×2211215481² = 9778947806828122722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2211215441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122845296 + ... + 122845313.

It is an arithmetic number, because the mean of its divisors is an integer number (532329655).

Almost surely, 2^2211215481 is an apocalyptic number.

It is an amenable number.

2211215481 is a deficient number, since it is larger than the sum of its proper divisors (982762449).

2211215481 is a wasteful number, since it uses less digits than its factorization.

2211215481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245690615 (or 245690612 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 2211215481 is about 47023.5630402461. The cubic root of 2211215481 is about 1302.7978167187.

The spelling of 2211215481 in words is "two billion, two hundred eleven million, two hundred fifteen thousand, four hundred eighty-one".