221191478004 has 216 divisors, whose sum is σ = 643470428160. Its totient is φ = 58948571136.

The previous prime is 221191477993. The next prime is 221191478017. The reversal of 221191478004 is 400874191122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19196557 + ... + 19208075.

It is an arithmetic number, because the mean of its divisors is an integer number (2979029760).

Almost surely, 2^221191478004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221191478004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321735214080).

221191478004 is an abundant number, since it is smaller than the sum of its proper divisors (422278950156).

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

221191478004 is a wasteful number, since it uses less digits than its factorization.

221191478004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11687 (or 11661 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The spelling of 221191478004 in words is "two hundred twenty-one billion, one hundred ninety-one million, four hundred seventy-eight thousand, four".