221213904072 has 128 divisors (see below), whose sum is σ = 634900896000. Its totient is φ = 62918489088.

The previous prime is 221213904029. The next prime is 221213904077. The reversal of 221213904072 is 270409312122.

It is not an unprimeable number, because it can be changed into a prime (221213904077) 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, 39691078 + ... + 39696650.

It is an arithmetic number, because the mean of its divisors is an integer number (4960163250).

Almost surely, 2^221213904072 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 221213904072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317450448000).

221213904072 is an abundant number, since it is smaller than the sum of its proper divisors (413686991928).

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

221213904072 is a wasteful number, since it uses less digits than its factorization.

221213904072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6615 (or 6611 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 221213904072 in words is "two hundred twenty-one billion, two hundred thirteen million, nine hundred four thousand, seventy-two".