20220404021 has 4 divisors (see below), whose sum is σ = 20601921132. Its totient is φ = 19838886912.

The previous prime is 20220404011. The next prime is 20220404081. The reversal of 20220404021 is 12040402202.

It is a happy number.

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 13744983121 + 6475420900 = 117239^2 + 80470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220404021 - 2¹⁰ = 20220402997 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 (20220404011) 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, 190758476 + ... + 190758581.

It is an arithmetic number, because the mean of its divisors is an integer number (5150480283).

Almost surely, 2^20220404021 is an apocalyptic number.

It is an amenable number.

20220404021 is a deficient number, since it is larger than the sum of its proper divisors (381517111).

20220404021 is an equidigital number, since it uses as much as digits as its factorization.

20220404021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381517110.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 20220404021 its reverse (12040402202), we get a palindrome (32260806223).

The spelling of 20220404021 in words is "twenty billion, two hundred twenty million, four hundred four thousand, twenty-one".