205121026000 has 80 divisors (see below), whose sum is σ = 541072029888. Its totient is φ = 74589456000.

The previous prime is 205121025953. The next prime is 205121026051. The reversal of 205121026000 is 620121502.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4639842 + ... + 4683841.

Almost surely, 2^205121026000 is an apocalyptic number.

205121026000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205121026000 is an abundant number, since it is smaller than the sum of its proper divisors (335951003888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205121026000 is a wasteful number, since it uses less digits than its factorization.

205121026000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323717 (or 9323701 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 205121026000 its reverse (620121502), we get a palindrome (205741147502).

The spelling of 205121026000 in words is "two hundred five billion, one hundred twenty-one million, twenty-six thousand".