121021010205 has 32 divisors (see below), whose sum is σ = 201221452800. Its totient is φ = 62043210240.

The previous prime is 121021010203. The next prime is 121021010233. The reversal of 121021010205 is 502010120121.

It is not a de Polignac number, because 121021010205 - 2¹ = 121021010203 is a prime.

It is a super-2 number, since 2×121021010205² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021010203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 804072 + ... + 942641.

It is an arithmetic number, because the mean of its divisors is an integer number (6288170400).

Almost surely, 2^121021010205 is an apocalyptic number.

121021010205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121021010205 is a deficient number, since it is larger than the sum of its proper divisors (80200442595).

121021010205 is a wasteful number, since it uses less digits than its factorization.

121021010205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746901.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 121021010205 its reverse (502010120121), we get a palindrome (623031130326).

The spelling of 121021010205 in words is "one hundred twenty-one billion, twenty-one million, ten thousand, two hundred five".