221063851 has 4 divisors (see below), whose sum is σ = 223252704. Its totient is φ = 218875000.

The previous prime is 221063837. The next prime is 221063867. The reversal of 221063851 is 158360122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221063851 - 2¹⁹ = 220539563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221069851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094275 + ... + 1094476.

It is an arithmetic number, because the mean of its divisors is an integer number (55813176).

Almost surely, 2^221063851 is an apocalyptic number.

221063851 is a deficient number, since it is larger than the sum of its proper divisors (2188853).

221063851 is a wasteful number, since it uses less digits than its factorization.

221063851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188852.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 221063851 is about 14868.2161337532. The cubic root of 221063851 is about 604.6525801703.

The spelling of 221063851 in words is "two hundred twenty-one million, sixty-three thousand, eight hundred fifty-one".