221140251 has 6 divisors (see below), whose sum is σ = 319424820. Its totient is φ = 147426828.

The previous prime is 221140237. The next prime is 221140273. The reversal of 221140251 is 152041122.

221140251 is a `hidden beast` number, since 2 + 211 + 402 + 51 = 666.

It is not a de Polignac number, because 221140251 - 2⁶ = 221140187 is a prime.

It is a super-2 number, since 2×221140251² = 97806021224686002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221140291) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12285561 + ... + 12285578.

It is an arithmetic number, because the mean of its divisors is an integer number (53237470).

Almost surely, 2^221140251 is an apocalyptic number.

221140251 is a deficient number, since it is larger than the sum of its proper divisors (98284569).

221140251 is a wasteful number, since it uses less digits than its factorization.

221140251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24571145 (or 24571142 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221140251 is about 14870.7851507578. The cubic root of 221140251 is about 604.7222284283.

Adding to 221140251 its reverse (152041122), we get a palindrome (373181373).

The spelling of 221140251 in words is "two hundred twenty-one million, one hundred forty thousand, two hundred fifty-one".