202101 has 16 divisors (see below), whose sum is σ = 293760. Its totient is φ = 123200.

The previous prime is 202099. The next prime is 202109. The reversal of 202101 is 101202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 202101 - 2¹ = 202099 is a prime.

It is a super-3 number, since 3×202101³ = 24764333384508903, which contains 333 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 202101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1951 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (18360).

2²⁰²¹⁰¹ is an apocalyptic number.

It is an amenable number.

202101 is a deficient number, since it is larger than the sum of its proper divisors (91659).

202101 is a wasteful number, since it uses less digits than its factorization.

202101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 202101 is about 449.5564480685. The cubic root of 202101 is about 58.6844205622.

Adding to 202101 its reverse (101202), we get a palindrome (303303).

It can be divided in two parts, 202 and 101, that multiplied together give a palindrome (20402).

The spelling of 202101 in words is "two hundred two thousand, one hundred one", and thus it is an iban number.