221073356 has 12 divisors (see below), whose sum is σ = 442146768. Its totient is φ = 94745712.

The previous prime is 221073331. The next prime is 221073361. The reversal of 221073356 is 653370122.

221073356 is an admirable 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, 3947711 + ... + 3947766.

It is an arithmetic number, because the mean of its divisors is an integer number (36845564).

Almost surely, 2^221073356 is an apocalyptic number.

It is an amenable number.

221073356 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221073356 is a wasteful number, since it uses less digits than its factorization.

221073356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7895488 (or 7895486 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 221073356 is about 14868.5357718909. The cubic root of 221073356 is about 604.6612460533.

The spelling of 221073356 in words is "two hundred twenty-one million, seventy-three thousand, three hundred fifty-six".