202122101 has 4 divisors (see below), whose sum is σ = 204205932. Its totient is φ = 200038272.

The previous prime is 202122073. The next prime is 202122113. The reversal of 202122101 is 101221202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42706225 + 159415876 = 6535^2 + 12626^2 .

It is a cyclic number.

It is not a de Polignac number, because 202122101 - 2²⁶ = 135013237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041770 + ... + 1041963.

It is an arithmetic number, because the mean of its divisors is an integer number (51051483).

Almost surely, 2^202122101 is an apocalyptic number.

It is an amenable number.

202122101 is a deficient number, since it is larger than the sum of its proper divisors (2083831).

202122101 is an equidigital number, since it uses as much as digits as its factorization.

202122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2083830.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 202122101 is about 14216.9652528238. The cubic root of 202122101 is about 586.8646286921.

Adding to 202122101 its reverse (101221202), we get a palindrome (303343303).

The spelling of 202122101 in words is "two hundred two million, one hundred twenty-two thousand, one hundred one".