3420203021 has 8 divisors (see below), whose sum is σ = 3634284024. Its totient is φ = 3207554560.

The previous prime is 3420202993. The next prime is 3420203027. The reversal of 3420203021 is 1203020243.

It can be written as a sum of positive squares in 4 ways, for example, as 403447396 + 3016755625 = 20086^2 + 54925^2 .

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

It is not a de Polignac number, because 3420203021 - 2¹⁸ = 3419940877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420203027) 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, 353210 + ... + 362763.

It is an arithmetic number, because the mean of its divisors is an integer number (454285503).

Almost surely, 2^3420203021 is an apocalyptic number.

It is an amenable number.

3420203021 is a deficient number, since it is larger than the sum of its proper divisors (214081003).

3420203021 is a wasteful number, since it uses less digits than its factorization.

3420203021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716271.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 3420203021 is about 58482.5018360193. The cubic root of 3420203021 is about 1506.6670667621.

Adding to 3420203021 its reverse (1203020243), we get a palindrome (4623223264).

The spelling of 3420203021 in words is "three billion, four hundred twenty million, two hundred three thousand, twenty-one".