221050551 has 8 divisors (see below), whose sum is σ = 297489024. Its totient is φ = 145989560.

The previous prime is 221050549. The next prime is 221050591. The reversal of 221050551 is 155050122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221050551 - 2¹ = 221050549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221050591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343995 + ... + 344636.

It is an arithmetic number, because the mean of its divisors is an integer number (37186128).

Almost surely, 2^221050551 is an apocalyptic number.

221050551 is a deficient number, since it is larger than the sum of its proper divisors (76438473).

221050551 is a wasteful number, since it uses less digits than its factorization.

221050551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688741.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 221050551 is about 14867.7688642244. The cubic root of 221050551 is about 604.6404538991.

The spelling of 221050551 in words is "two hundred twenty-one million, fifty thousand, five hundred fifty-one".