221340051 has 24 divisors (see below), whose sum is σ = 339992640. Its totient is φ = 138276096.

The previous prime is 221340043. The next prime is 221340059. The reversal of 221340051 is 150043122.

221340051 is a `hidden beast` number, since 2 + 213 + 400 + 51 = 666.

It is an interprime number because it is at equal distance from previous prime (221340043) and next prime (221340059).

It is not a de Polignac number, because 221340051 - 2³ = 221340043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221340059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33541 + ... + 39593.

It is an arithmetic number, because the mean of its divisors is an integer number (14166360).

Almost surely, 2^221340051 is an apocalyptic number.

221340051 is a deficient number, since it is larger than the sum of its proper divisors (118652589).

221340051 is a wasteful number, since it uses less digits than its factorization.

221340051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6315 (or 6312 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221340051 is about 14877.5015039488. The cubic root of 221340051 is about 604.9042955870.

Adding to 221340051 its reverse (150043122), we get a palindrome (371383173).

The spelling of 221340051 in words is "two hundred twenty-one million, three hundred forty thousand, fifty-one".