221143211553 has 32 divisors (see below), whose sum is σ = 340664044032. Its totient is φ = 126112723200.

The previous prime is 221143211551. The next prime is 221143211563. The reversal of 221143211553 is 355112341122.

It is a happy number.

It is not a de Polignac number, because 221143211553 - 2¹ = 221143211551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221143211553.

It is not an unprimeable number, because it can be changed into a prime (221143211551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2470998 + ... + 2558928.

It is an arithmetic number, because the mean of its divisors is an integer number (10645751376).

Almost surely, 2^221143211553 is an apocalyptic number.

It is an amenable number.

221143211553 is a deficient number, since it is larger than the sum of its proper divisors (119520832479).

221143211553 is a wasteful number, since it uses less digits than its factorization.

221143211553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92445.

The product of its digits is 7200, while the sum is 30.

Adding to 221143211553 its reverse (355112341122), we get a palindrome (576255552675).

The spelling of 221143211553 in words is "two hundred twenty-one billion, one hundred forty-three million, two hundred eleven thousand, five hundred fifty-three".