221641656145500 has 96 divisors (see below), whose sum is σ = 645425551068480. Its totient is φ = 59103979334400.

The previous prime is 221641656145451. The next prime is 221641656145501. The reversal of 221641656145500 is 5541656146122.

It is a happy number.

221641656145500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221641656145500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221641656145501) 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, 219078814 + ... + 220088186.

It is an arithmetic number, because the mean of its divisors is an integer number (6723182823630).

Almost surely, 2^{221641656145500} is an apocalyptic number.

221641656145500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221641656145500 is an abundant number, since it is smaller than the sum of its proper divisors (423783894922980).

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

221641656145500 is a wasteful number, since it uses less digits than its factorization.

221641656145500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155784 (or 1155772 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 221641656145500 in words is "two hundred twenty-one trillion, six hundred forty-one billion, six hundred fifty-six million, one hundred forty-five thousand, five hundred".