221004992 has 56 divisors (see below), whose sum is σ = 474128592. Its totient is φ = 101606400.

The previous prime is 221004929. The next prime is 221005003. The reversal of 221004992 is 299400122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408242 + ... + 408782.

It is an arithmetic number, because the mean of its divisors is an integer number (8466582).

Almost surely, 2^221004992 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 221004992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (237064296).

221004992 is an abundant number, since it is smaller than the sum of its proper divisors (253123600).

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

221004992 is a wasteful number, since it uses less digits than its factorization.

221004992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057 (or 1047 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221004992 is about 14866.2366454998. The cubic root of 221004992 is about 604.5989118069.

The spelling of 221004992 in words is "two hundred twenty-one million, four thousand, nine hundred ninety-two".