202121022122011 has 4 divisors (see below), whose sum is σ = 202156675862400. Its totient is φ = 202085368381624.

The previous prime is 202121022121937. The next prime is 202121022122017. The reversal of 202121022122011 is 110221220121202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202121022122011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202121022122011.

It is not an unprimeable number, because it can be changed into a prime (202121022122017) 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, 17826861691 + ... + 17826873028.

It is an arithmetic number, because the mean of its divisors is an integer number (50539168965600).

Almost surely, 2^{202121022122011} is an apocalyptic number.

202121022122011 is a deficient number, since it is larger than the sum of its proper divisors (35653740389).

202121022122011 is an equidigital number, since it uses as much as digits as its factorization.

202121022122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35653740388.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202121022122011 its reverse (110221220121202), we get a palindrome (312342242243213).

The spelling of 202121022122011 in words is "two hundred two trillion, one hundred twenty-one billion, twenty-two million, one hundred twenty-two thousand, eleven".