205429219397 has 4 divisors (see below), whose sum is σ = 205477938156. Its totient is φ = 205380500640.

The previous prime is 205429219351. The next prime is 205429219399. The reversal of 205429219397 is 793912924502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 198618183556 + 6811035841 = 445666^2 + 82529^2 .

It is a cyclic number.

It is not a de Polignac number, because 205429219397 - 2⁸ = 205429219141 is a prime.

It is a super-2 number, since 2×205429219397² (a number of 23 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 (205429219399) 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, 24353054 + ... + 24361487.

It is an arithmetic number, because the mean of its divisors is an integer number (51369484539).

Almost surely, 2^205429219397 is an apocalyptic number.

It is an amenable number.

205429219397 is a deficient number, since it is larger than the sum of its proper divisors (48718759).

205429219397 is an equidigital number, since it uses as much as digits as its factorization.

205429219397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48718758.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 205429219397 in words is "two hundred five billion, four hundred twenty-nine million, two hundred nineteen thousand, three hundred ninety-seven".