354021203509 has 4 divisors (see below), whose sum is σ = 374845980204. Its totient is φ = 333196426816.

The previous prime is 354021203491. The next prime is 354021203519. The reversal of 354021203509 is 905302120453.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905302120453 = 17 ⋅53253065909.

It can be written as a sum of positive squares in 2 ways, for example, as 218909822884 + 135111380625 = 467878^2 + 367575^2 .

It is a cyclic number.

It is not a de Polignac number, because 354021203509 - 2⁵ = 354021203477 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 (354021203519) 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, 10412388322 + ... + 10412388355.

It is an arithmetic number, because the mean of its divisors is an integer number (93711495051).

Almost surely, 2^354021203509 is an apocalyptic number.

It is an amenable number.

354021203509 is a deficient number, since it is larger than the sum of its proper divisors (20824776695).

354021203509 is a wasteful number, since it uses less digits than its factorization.

354021203509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20824776694.

The product of its (nonzero) digits is 32400, while the sum is 34.

The spelling of 354021203509 in words is "three hundred fifty-four billion, twenty-one million, two hundred three thousand, five hundred nine".