205602153121 has 4 divisors (see below), whose sum is σ = 205679362752. Its totient is φ = 205524943492.

The previous prime is 205602153079. The next prime is 205602153143. The reversal of 205602153121 is 121351206502.

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 205602153121 - 2²³ = 205593764513 is a prime.

It is a super-2 number, since 2×205602153121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205602153121.

It is not an unprimeable number, because it can be changed into a prime (205602153191) 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, 38600821 + ... + 38606146.

It is an arithmetic number, because the mean of its divisors is an integer number (51419840688).

Almost surely, 2^205602153121 is an apocalyptic number.

It is an amenable number.

205602153121 is a deficient number, since it is larger than the sum of its proper divisors (77209631).

205602153121 is an equidigital number, since it uses as much as digits as its factorization.

205602153121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77209630.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 205602153121 its reverse (121351206502), we get a palindrome (326953359623).

The spelling of 205602153121 in words is "two hundred five billion, six hundred two million, one hundred fifty-three thousand, one hundred twenty-one".