221162401 has 16 divisors (see below), whose sum is σ = 246896640. Its totient is φ = 197130240.

The previous prime is 221162399. The next prime is 221162407. The reversal of 221162401 is 104261122.

It is not a de Polignac number, because 221162401 - 2¹ = 221162399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221162407) 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, 20305 + ... + 29233.

It is an arithmetic number, because the mean of its divisors is an integer number (15431040).

Almost surely, 2^221162401 is an apocalyptic number.

It is an amenable number.

221162401 is a deficient number, since it is larger than the sum of its proper divisors (25734239).

221162401 is a wasteful number, since it uses less digits than its factorization.

221162401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9024.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 221162401 is about 14871.5298809504. The cubic root of 221162401 is about 604.7424179537.

The spelling of 221162401 in words is "two hundred twenty-one million, one hundred sixty-two thousand, four hundred one".