202121013 has 16 divisors (see below), whose sum is σ = 274349376. Its totient is φ = 132336000.

The previous prime is 202120979. The next prime is 202121053. The reversal of 202121013 is 310121202.

It is not a de Polignac number, because 202121013 - 2¹⁰ = 202119989 is a prime.

It is a super-2 number, since 2×202121013² = 81705807792292338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 202121013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53131 + ... + 56807.

It is an arithmetic number, because the mean of its divisors is an integer number (17146836).

Almost surely, 2^202121013 is an apocalyptic number.

It is an amenable number.

202121013 is a deficient number, since it is larger than the sum of its proper divisors (72228363).

202121013 is a wasteful number, since it uses less digits than its factorization.

202121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 202121013 is about 14216.9269886287. The cubic root of 202121013 is about 586.8635756820.

Adding to 202121013 its reverse (310121202), we get a palindrome (512242215).

The spelling of 202121013 in words is "two hundred two million, one hundred twenty-one thousand, thirteen".