355521134140021 has 4 divisors (see below), whose sum is σ = 355855584878752. Its totient is φ = 355186683401292.

The previous prime is 355521134140019. The next prime is 355521134140093. The reversal of 355521134140021 is 120041431125553.

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 not a de Polignac number, because 355521134140021 - 2¹ = 355521134140019 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 (355521134149021) 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, 167225367771 + ... + 167225369896.

It is an arithmetic number, because the mean of its divisors is an integer number (88963896219688).

Almost surely, 2^{355521134140021} is an apocalyptic number.

It is an amenable number.

355521134140021 is a deficient number, since it is larger than the sum of its proper divisors (334450738731).

355521134140021 is a wasteful number, since it uses less digits than its factorization.

355521134140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334450738730.

The product of its (nonzero) digits is 72000, while the sum is 37.

Adding to 355521134140021 its reverse (120041431125553), we get a palindrome (475562565265574).

The spelling of 355521134140021 in words is "three hundred fifty-five trillion, five hundred twenty-one billion, one hundred thirty-four million, one hundred forty thousand, twenty-one".