202121011091 has 8 divisors (see below), whose sum is σ = 205681844160. Its totient is φ = 198564679912.

The previous prime is 202121011051. The next prime is 202121011117. The reversal of 202121011091 is 190110121202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202121011091 - 2²² = 202116816787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202121011051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1034825 + ... + 1214538.

It is an arithmetic number, because the mean of its divisors is an integer number (25710230520).

Almost surely, 2^202121011091 is an apocalyptic number.

202121011091 is a deficient number, since it is larger than the sum of its proper divisors (3560833069).

202121011091 is a wasteful number, since it uses less digits than its factorization.

202121011091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2250945.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 202121011091 its reverse (190110121202), we get a palindrome (392231132293).

The spelling of 202121011091 in words is "two hundred two billion, one hundred twenty-one million, eleven thousand, ninety-one".