202010121 has 24 divisors (see below), whose sum is σ = 300460680. Its totient is φ = 130692096.

The previous prime is 202010117. The next prime is 202010129. The reversal of 202010121 is 121010202.

It can be written as a sum of positive squares in 4 ways, for example, as 4888521 + 197121600 = 2211^2 + 14040^2 .

It is not a de Polignac number, because 202010121 - 2² = 202010117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (202010129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216985 + ... + 217913.

It is an arithmetic number, because the mean of its divisors is an integer number (12519195).

Almost surely, 2^202010121 is an apocalyptic number.

It is an amenable number.

202010121 is a deficient number, since it is larger than the sum of its proper divisors (98450559).

202010121 is a wasteful number, since it uses less digits than its factorization.

202010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625 (or 1622 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 202010121 is about 14213.0264546296. The cubic root of 202010121 is about 586.7562301206.

Adding to 202010121 its reverse (121010202), we get a palindrome (323020323).

The spelling of 202010121 in words is "two hundred two million, ten thousand, one hundred twenty-one".