20204035221 has 4 divisors (see below), whose sum is σ = 26938713632. Its totient is φ = 13469356812.

The previous prime is 20204035217. The next prime is 20204035223. The reversal of 20204035221 is 12253040202.

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 not a de Polignac number, because 20204035221 - 2² = 20204035217 is a prime.

It is a super-2 number, since 2×20204035221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204035223) 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, 3367339201 + ... + 3367339206.

It is an arithmetic number, because the mean of its divisors is an integer number (6734678408).

Almost surely, 2^20204035221 is an apocalyptic number.

It is an amenable number.

20204035221 is a deficient number, since it is larger than the sum of its proper divisors (6734678411).

20204035221 is an equidigital number, since it uses as much as digits as its factorization.

20204035221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6734678410.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 20204035221 its reverse (12253040202), we get a palindrome (32457075423).

The spelling of 20204035221 in words is "twenty billion, two hundred four million, thirty-five thousand, two hundred twenty-one".