202122091 has 4 divisors (see below), whose sum is σ = 210910032. Its totient is φ = 193334152.

The previous prime is 202122073. The next prime is 202122113. The reversal of 202122091 is 190221202.

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

It is a cyclic number.

It is not a de Polignac number, because 202122091 - 2⁷ = 202121963 is a prime.

It is a Duffinian 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, 4393936 + ... + 4393981.

It is an arithmetic number, because the mean of its divisors is an integer number (52727508).

Almost surely, 2^202122091 is an apocalyptic number.

202122091 is a deficient number, since it is larger than the sum of its proper divisors (8787941).

202122091 is an equidigital number, since it uses as much as digits as its factorization.

202122091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8787940.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 202122091 is about 14216.9649011313. The cubic root of 202122091 is about 586.8646190138.

Adding to 202122091 its reverse (190221202), we get a palindrome (392343293).

The spelling of 202122091 in words is "two hundred two million, one hundred twenty-two thousand, ninety-one".