221816126384 has 60 divisors (see below), whose sum is σ = 459660313488. Its totient is φ = 103498222080.

The previous prime is 221816126383. The next prime is 221816126387. The reversal of 221816126384 is 483621618122.

It is not an unprimeable number, because it can be changed into a prime (221816126383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439322 + ... + 797894.

Almost surely, 2^221816126384 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 221816126384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229830156744).

221816126384 is an abundant number, since it is smaller than the sum of its proper divisors (237844187104).

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

221816126384 is a wasteful number, since it uses less digits than its factorization.

221816126384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358686 (or 358639 counting only the distinct ones).

The product of its digits is 221184, while the sum is 44.

The spelling of 221816126384 in words is "two hundred twenty-one billion, eight hundred sixteen million, one hundred twenty-six thousand, three hundred eighty-four".