202110122220121 has 4 divisors (see below), whose sum is σ = 202167199355044. Its totient is φ = 202053045085200.

The previous prime is 202110122220079. The next prime is 202110122220131. The reversal of 202110122220121 is 121022221011202.

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 43464484417600 + 158645637802521 = 6592760^2 + 12595461^2 .

It is a cyclic number.

It is not a de Polignac number, because 202110122220121 - 2²³ = 202110113831513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202110122220131) 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, 28538562150 + ... + 28538569231.

It is an arithmetic number, because the mean of its divisors is an integer number (50541799838761).

Almost surely, 2^{202110122220121} is an apocalyptic number.

It is an amenable number.

202110122220121 is a deficient number, since it is larger than the sum of its proper divisors (57077134923).

202110122220121 is an equidigital number, since it uses as much as digits as its factorization.

202110122220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57077134922.

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

Adding to 202110122220121 its reverse (121022221011202), we get a palindrome (323132343231323).

The spelling of 202110122220121 in words is "two hundred two trillion, one hundred ten billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".