3420544021 has 4 divisors (see below), whose sum is σ = 3426236044. Its totient is φ = 3414852000.

The previous prime is 3420544009. The next prime is 3420544037. The reversal of 3420544021 is 1204450243.

It is a happy number.

3420544021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2953379025 + 467164996 = 54345^2 + 21614^2 .

It is a cyclic number.

It is not a de Polignac number, because 3420544021 - 2¹³ = 3420535829 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 (3420544321) 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, 2845110 + ... + 2846311.

It is an arithmetic number, because the mean of its divisors is an integer number (856559011).

Almost surely, 2^3420544021 is an apocalyptic number.

It is an amenable number.

3420544021 is a deficient number, since it is larger than the sum of its proper divisors (5692023).

3420544021 is an equidigital number, since it uses as much as digits as its factorization.

3420544021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5692022.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 3420544021 is about 58485.4171653071. The cubic root of 3420544021 is about 1506.7171375125.

Adding to 3420544021 its reverse (1204450243), we get a palindrome (4624994264).

The spelling of 3420544021 in words is "three billion, four hundred twenty million, five hundred forty-four thousand, twenty-one".