2221643405 has 8 divisors (see below), whose sum is σ = 2667298200. Its totient is φ = 1776430656.

The previous prime is 2221643401. The next prime is 2221643441. The reversal of 2221643405 is 5043461222.

It can be written as a sum of positive squares in 4 ways, for example, as 1570219876 + 651423529 = 39626^2 + 25523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2221643405 - 2² = 2221643401 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221643401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99350 + ... + 119639.

It is an arithmetic number, because the mean of its divisors is an integer number (333412275).

Almost surely, 2^2221643405 is an apocalyptic number.

It is an amenable number.

2221643405 is a deficient number, since it is larger than the sum of its proper divisors (445654795).

2221643405 is a wasteful number, since it uses less digits than its factorization.

2221643405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221023.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 2221643405 is about 47134.3123955362. The cubic root of 2221643405 is about 1304.8425709106.

The spelling of 2221643405 in words is "two billion, two hundred twenty-one million, six hundred forty-three thousand, four hundred five".