205121121502 has 32 divisors (see below), whose sum is σ = 341396467200. Its totient is φ = 91641902400.

The previous prime is 205121121461. The next prime is 205121121539.

It is a happy number.

205121121502 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14479899 + ... + 14494057.

It is an arithmetic number, because the mean of its divisors is an integer number (10668639600).

Almost surely, 2^205121121502 is an apocalyptic number.

205121121502 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

205121121502 is a deficient number, since it is larger than the sum of its proper divisors (136275345698).

205121121502 is a wasteful number, since it uses less digits than its factorization.

205121121502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25392.

The product of its (nonzero) digits is 400, while the sum is 22.

It can be divided in two parts, 205121 and 121502, that added together give a palindrome (326623).

The spelling of 205121121502 in words is "two hundred five billion, one hundred twenty-one million, one hundred twenty-one thousand, five hundred two".