221120251 has 16 divisors (see below), whose sum is σ = 248428800. Its totient is φ = 195043680.

The previous prime is 221120239. The next prime is 221120269. The reversal of 221120251 is 152021122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221120251 - 2⁵ = 221120219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221120231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243340 + ... + 244246.

It is an arithmetic number, because the mean of its divisors is an integer number (15526800).

Almost surely, 2^221120251 is an apocalyptic number.

221120251 is a deficient number, since it is larger than the sum of its proper divisors (27308549).

221120251 is a wasteful number, since it uses less digits than its factorization.

221120251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221120251 is about 14870.1126761030. The cubic root of 221120251 is about 604.7039974502.

Adding to 221120251 its reverse (152021122), we get a palindrome (373141373).

The spelling of 221120251 in words is "two hundred twenty-one million, one hundred twenty thousand, two hundred fifty-one".