221153020451 has 16 divisors (see below), whose sum is σ = 255478974048. Its totient is φ = 189199987200.

The previous prime is 221153020441. The next prime is 221153020471. The reversal of 221153020451 is 154020351122.

It is a cyclic number.

It is not a de Polignac number, because 221153020451 - 2¹⁰ = 221153019427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221153020451.

It is not an unprimeable number, because it can be changed into a prime (221153020421) 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 15 ways as a sum of consecutive naturals, for example, 1674161 + ... + 1801421.

It is an arithmetic number, because the mean of its divisors is an integer number (15967435878).

Almost surely, 2^221153020451 is an apocalyptic number.

221153020451 is a deficient number, since it is larger than the sum of its proper divisors (34325953597).

221153020451 is a wasteful number, since it uses less digits than its factorization.

221153020451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136582.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 221153020451 its reverse (154020351122), we get a palindrome (375173371573).

The spelling of 221153020451 in words is "two hundred twenty-one billion, one hundred fifty-three million, twenty thousand, four hundred fifty-one".