221554730656240 has 40 divisors (see below), whose sum is σ = 522803028620880. Its totient is φ = 87299177450496.

The previous prime is 221554730656223. The next prime is 221554730656249. The reversal of 221554730656240 is 42656037455122.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×221554730656240² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221554730656249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20667413545 + ... + 20667424264.

It is an arithmetic number, because the mean of its divisors is an integer number (13070075715522).

Almost surely, 2^{221554730656240} is an apocalyptic number.

221554730656240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221554730656240 is an abundant number, since it is smaller than the sum of its proper divisors (301248297964640).

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

221554730656240 is a wasteful number, since it uses less digits than its factorization.

221554730656240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41334837889 (or 41334837883 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 52.

The spelling of 221554730656240 in words is "two hundred twenty-one trillion, five hundred fifty-four billion, seven hundred thirty million, six hundred fifty-six thousand, two hundred forty".