4020215021 has 4 divisors (see below), whose sum is σ = 4057787232. Its totient is φ = 3982642812.

The previous prime is 4020214999. The next prime is 4020215033. The reversal of 4020215021 is 1205120204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4020215021 - 2¹⁸ = 4019952877 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 (4020215071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18785945 + ... + 18786158.

It is an arithmetic number, because the mean of its divisors is an integer number (1014446808).

Almost surely, 2^4020215021 is an apocalyptic number.

It is an amenable number.

4020215021 is a deficient number, since it is larger than the sum of its proper divisors (37572211).

4020215021 is a wasteful number, since it uses less digits than its factorization.

4020215021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37572210.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 4020215021 is about 63405.1655703224. The cubic root of 4020215021 is about 1590.0706719375.

Adding to 4020215021 its reverse (1205120204), we get a palindrome (5225335225).

The spelling of 4020215021 in words is "four billion, twenty million, two hundred fifteen thousand, twenty-one".