221534451744564 has 96 divisors (see below), whose sum is σ = 621861138841600. Its totient is φ = 59963243760000.

The previous prime is 221534451744559. The next prime is 221534451744569. The reversal of 221534451744564 is 465447154435122.

It is an interprime number because it is at equal distance from previous prime (221534451744559) and next prime (221534451744569).

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221534451744569) 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 31 ways as a sum of consecutive naturals, for example, 100590189 + ... + 102768939.

Almost surely, 2^{221534451744564} is an apocalyptic number.

It is an amenable number.

221534451744564 is an abundant number, since it is smaller than the sum of its proper divisors (400326687097036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221534451744564 is a wasteful number, since it uses less digits than its factorization.

221534451744564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242493 (or 2242491 counting only the distinct ones).

The product of its digits is 64512000, while the sum is 57.

The spelling of 221534451744564 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred fifty-one million, seven hundred forty-four thousand, five hundred sixty-four".