202122100121 has 4 divisors (see below), whose sum is σ = 205138847952. Its totient is φ = 199105352292.

The previous prime is 202122100097. The next prime is 202122100171. The reversal of 202122100121 is 121001221202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121001221202 = 2 ⋅60500610601.

It is a de Polignac number, because none of the positive numbers 2^k-202122100121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202122100096 and 202122100105.

It is not an unprimeable number, because it can be changed into a prime (202122100171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1508373815 + ... + 1508373948.

It is an arithmetic number, because the mean of its divisors is an integer number (51284711988).

Almost surely, 2^202122100121 is an apocalyptic number.

It is an amenable number.

202122100121 is a deficient number, since it is larger than the sum of its proper divisors (3016747831).

202122100121 is an equidigital number, since it uses as much as digits as its factorization.

202122100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3016747830.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 202122100121 its reverse (121001221202), we get a palindrome (323123321323).

The spelling of 202122100121 in words is "two hundred two billion, one hundred twenty-two million, one hundred thousand, one hundred twenty-one".