3405620221 has 4 divisors (see below), whose sum is σ = 3407921244. Its totient is φ = 3403319200.

The previous prime is 3405620219. The next prime is 3405620237. The reversal of 3405620221 is 1220265043.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2329124121 + 1076496100 = 48261^2 + 32810^2 .

It is a cyclic number.

It is not a de Polignac number, because 3405620221 - 2¹ = 3405620219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3405620521) 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, 1148290 + ... + 1151251.

It is an arithmetic number, because the mean of its divisors is an integer number (851980311).

Almost surely, 2^3405620221 is an apocalyptic number.

It is an amenable number.

3405620221 is a deficient number, since it is larger than the sum of its proper divisors (2301023).

3405620221 is a wasteful number, since it uses less digits than its factorization.

3405620221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2301022.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 3405620221 is about 58357.6920465503. The cubic root of 3405620221 is about 1504.5226789155.

Adding to 3405620221 its reverse (1220265043), we get a palindrome (4625885264).

The spelling of 3405620221 in words is "three billion, four hundred five million, six hundred twenty thousand, two hundred twenty-one".