20355253404221 has 8 divisors (see below), whose sum is σ = 20359856641344. Its totient is φ = 20350650528000.

The previous prime is 20355253404103. The next prime is 20355253404349. The reversal of 20355253404221 is 12240435255302.

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

It is a cyclic number.

It is not a de Polignac number, because 20355253404221 - 2²² = 20355249209917 is a prime.

It is a super-4 number, since 4×20355253404221⁴ (a number of 54 digits) contains 4444 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 (20355253404721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134882210 + ... + 135033036.

It is an arithmetic number, because the mean of its divisors is an integer number (2544982080168).

Almost surely, 2^{20355253404221} is an apocalyptic number.

It is an amenable number.

20355253404221 is a deficient number, since it is larger than the sum of its proper divisors (4603237123).

20355253404221 is a wasteful number, since it uses less digits than its factorization.

20355253404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180451.

The product of its (nonzero) digits is 288000, while the sum is 38.

Adding to 20355253404221 its reverse (12240435255302), we get a palindrome (32595688659523).

The spelling of 20355253404221 in words is "twenty trillion, three hundred fifty-five billion, two hundred fifty-three million, four hundred four thousand, two hundred twenty-one".