2545221111 has 4 divisors (see below), whose sum is σ = 3393628152. Its totient is φ = 1696814072.

The previous prime is 2545221061. The next prime is 2545221137. The reversal of 2545221111 is 1111225452.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2545221111 - 2⁷ = 2545220983 is a prime.

It is a super-4 number, since 4×2545221111⁴ (a number of 39 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545221191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424203516 + ... + 424203521.

It is an arithmetic number, because the mean of its divisors is an integer number (848407038).

Almost surely, 2^2545221111 is an apocalyptic number.

2545221111 is a deficient number, since it is larger than the sum of its proper divisors (848407041).

2545221111 is an equidigital number, since it uses as much as digits as its factorization.

2545221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848407040.

The product of its digits is 800, while the sum is 24.

The square root of 2545221111 is about 50450.1844496133. The cubic root of 2545221111 is about 1365.3432227385.

Adding to 2545221111 its reverse (1111225452), we get a palindrome (3656446563).

The spelling of 2545221111 in words is "two billion, five hundred forty-five million, two hundred twenty-one thousand, one hundred eleven".