221170051 has 16 divisors (see below), whose sum is σ = 248434560. Its totient is φ = 195661440.

The previous prime is 221170049. The next prime is 221170063. The reversal of 221170051 is 150071122.

221170051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221170051 - 2¹ = 221170049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221170451) 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, 39700 + ... + 44926.

It is an arithmetic number, because the mean of its divisors is an integer number (15527160).

Almost surely, 2^221170051 is an apocalyptic number.

221170051 is a deficient number, since it is larger than the sum of its proper divisors (27264509).

221170051 is a wasteful number, since it uses less digits than its factorization.

221170051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5394.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 221170051 is about 14871.7870815851. The cubic root of 221170051 is about 604.7493905466.

The spelling of 221170051 in words is "two hundred twenty-one million, one hundred seventy thousand, fifty-one".