11221451553 has 64 divisors (see below), whose sum is σ = 16754169600. Its totient is φ = 6637682688.

The previous prime is 11221451539. The next prime is 11221451587. The reversal of 11221451553 is 35515412211.

It is not a de Polignac number, because 11221451553 - 2⁹ = 11221451041 is a prime.

It is a super-2 number, since 2×11221451553² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11221451553.

It is not an unprimeable number, because it can be changed into a prime (11221451453) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24991873 + ... + 24992321.

It is an arithmetic number, because the mean of its divisors is an integer number (261783900).

Almost surely, 2^11221451553 is an apocalyptic number.

11221451553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

11221451553 is a deficient number, since it is larger than the sum of its proper divisors (5532718047).

11221451553 is a wasteful number, since it uses less digits than its factorization.

11221451553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738.

The product of its digits is 6000, while the sum is 30.

Adding to 11221451553 its reverse (35515412211), we get a palindrome (46736863764).

The spelling of 11221451553 in words is "eleven billion, two hundred twenty-one million, four hundred fifty-one thousand, five hundred fifty-three".