221067264 has 96 divisors (see below), whose sum is σ = 643144320. Its totient is φ = 66969600.

The previous prime is 221067239. The next prime is 221067281. The reversal of 221067264 is 462760122.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

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, 65949 + ... + 69219.

It is an arithmetic number, because the mean of its divisors is an integer number (6699420).

Almost surely, 2^221067264 is an apocalyptic number.

221067264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221067264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321572160).

221067264 is an abundant number, since it is smaller than the sum of its proper divisors (422077056).

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

221067264 is a wasteful number, since it uses less digits than its factorization.

221067264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3307 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 221067264 is about 14868.3309083434. The cubic root of 221067264 is about 604.6556918936.

The spelling of 221067264 in words is "two hundred twenty-one million, sixty-seven thousand, two hundred sixty-four".