111220215553 has 4 divisors (see below), whose sum is σ = 112321405908. Its totient is φ = 110119025200.

The previous prime is 111220215521. The next prime is 111220215577. The reversal of 111220215553 is 355512022111.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 107091253504 + 4128962049 = 327248^2 + 64257^2 .

It is a cyclic number.

It is not a de Polignac number, because 111220215553 - 2⁵ = 111220215521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111220815553) 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, 550595026 + ... + 550595227.

It is an arithmetic number, because the mean of its divisors is an integer number (28080351477).

Almost surely, 2^111220215553 is an apocalyptic number.

It is an amenable number.

111220215553 is a deficient number, since it is larger than the sum of its proper divisors (1101190355).

111220215553 is a wasteful number, since it uses less digits than its factorization.

111220215553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101190354.

The product of its (nonzero) digits is 3000, while the sum is 28.

Adding to 111220215553 its reverse (355512022111), we get a palindrome (466732237664).

The spelling of 111220215553 in words is "one hundred eleven billion, two hundred twenty million, two hundred fifteen thousand, five hundred fifty-three".