355521341555421 has 16 divisors (see below), whose sum is σ = 474122127800448. Its totient is φ = 236967392721600.

The previous prime is 355521341555323. The next prime is 355521341555447. The reversal of 355521341555421 is 124555143125553.

It is not a de Polignac number, because 355521341555421 - 2¹⁷ = 355521341424349 is a prime.

It is a super-2 number, since 2×355521341555421² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (355521341555461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2091327736 + ... + 2091497726.

It is an arithmetic number, because the mean of its divisors is an integer number (29632632987528).

Almost surely, 2^{355521341555421} is an apocalyptic number.

It is an amenable number.

355521341555421 is a deficient number, since it is larger than the sum of its proper divisors (118600786245027).

355521341555421 is a wasteful number, since it uses less digits than its factorization.

355521341555421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303652.

The product of its digits is 9000000, while the sum is 51.

The spelling of 355521341555421 in words is "three hundred fifty-five trillion, five hundred twenty-one billion, three hundred forty-one million, five hundred fifty-five thousand, four hundred twenty-one".