221067640 has 16 divisors (see below), whose sum is σ = 497402280. Its totient is φ = 88427040.

The previous prime is 221067629. The next prime is 221067661. The reversal of 221067640 is 46760122.

It is a junction number, because it is equal to n+sod(n) for n = 221067599 and 221067608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2763306 + ... + 2763385.

Almost surely, 2^221067640 is an apocalyptic number.

221067640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221067640 is an abundant number, since it is smaller than the sum of its proper divisors (276334640).

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

221067640 is a wasteful number, since it uses less digits than its factorization.

221067640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526702 (or 5526698 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 221067640 is about 14868.3435526625. The cubic root of 221067640 is about 604.6560347009.

The spelling of 221067640 in words is "two hundred twenty-one million, sixty-seven thousand, six hundred forty".