221445552000 has 128 divisors (see below), whose sum is σ = 734092164000. Its totient is φ = 59052134400.

The previous prime is 221445551959. The next prime is 221445552101. The reversal of 221445552000 is 255544122.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2258725 + ... + 2354724.

Almost surely, 2^221445552000 is an apocalyptic number.

221445552000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221445552000 is an abundant number, since it is smaller than the sum of its proper divisors (512646612000).

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

221445552000 is an equidigital number, since it uses as much as digits as its factorization.

221445552000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4613481 (or 4613459 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

The spelling of 221445552000 in words is "two hundred twenty-one billion, four hundred forty-five million, five hundred fifty-two thousand".