4020204202021 has 4 divisors (see below), whose sum is σ = 4594519088032. Its totient is φ = 3445889316012.

The previous prime is 4020204201973. The next prime is 4020204202033. The reversal of 4020204202021 is 1202024020204.

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 a de Polignac number, because none of the positive numbers 2^k-4020204202021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4020204202021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020204262021) 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, 287157442995 + ... + 287157443008.

It is an arithmetic number, because the mean of its divisors is an integer number (1148629772008).

Almost surely, 2^{4020204202021} is an apocalyptic number.

It is an amenable number.

4020204202021 is a deficient number, since it is larger than the sum of its proper divisors (574314886011).

4020204202021 is an equidigital number, since it uses as much as digits as its factorization.

4020204202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574314886010.

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 4020204202021 its reverse (1202024020204), we get a palindrome (5222228222225).

The spelling of 4020204202021 in words is "four trillion, twenty billion, two hundred four million, two hundred two thousand, twenty-one".