221238550 has 48 divisors (see below), whose sum is σ = 447440112. Its totient is φ = 80899200.

The previous prime is 221238529. The next prime is 221238551. The reversal of 221238550 is 55832122.

It is a super-2 number, since 2×221238550² = 97892992012205000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221238551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67960 + ... + 71140.

It is an arithmetic number, because the mean of its divisors is an integer number (9321669).

Almost surely, 2^221238550 is an apocalyptic number.

221238550 is an abundant number, since it is smaller than the sum of its proper divisors (226201562).

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

221238550 is a wasteful number, since it uses less digits than its factorization.

221238550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3313 (or 3308 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 221238550 is about 14874.0898881242. The cubic root of 221238550 is about 604.8118167996.

The spelling of 221238550 in words is "two hundred twenty-one million, two hundred thirty-eight thousand, five hundred fifty".