3420540221 has 32 divisors (see below), whose sum is σ = 4126603008. Its totient is φ = 2773854720.

The previous prime is 3420540209. The next prime is 3420540241. The reversal of 3420540221 is 1220450243.

It is a happy number.

It is not a de Polignac number, because 3420540221 - 2¹⁰ = 3420539197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420540241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3128951 + ... + 3130043.

It is an arithmetic number, because the mean of its divisors is an integer number (128956344).

Almost surely, 2^3420540221 is an apocalyptic number.

It is an amenable number.

3420540221 is a deficient number, since it is larger than the sum of its proper divisors (706062787).

3420540221 is a wasteful number, since it uses less digits than its factorization.

3420540221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 3420540221 is about 58485.3846785673. The cubic root of 3420540221 is about 1506.7165795577.

Adding to 3420540221 its reverse (1220450243), we get a palindrome (4640990464).

The spelling of 3420540221 in words is "three billion, four hundred twenty million, five hundred forty thousand, two hundred twenty-one".