202121010109 has 8 divisors (see below), whose sum is σ = 202580437752. Its totient is φ = 201661674240.

The previous prime is 202121010061. The next prime is 202121010127. The reversal of 202121010109 is 901010121202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 632025 + 202120378084 = 795^2 + 449578^2 .

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 202121010109 - 2¹⁵ = 202120977341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202121010409) 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, 6398137 + ... + 6429649.

It is an arithmetic number, because the mean of its divisors is an integer number (25322554719).

Almost surely, 2^202121010109 is an apocalyptic number.

It is an amenable number.

202121010109 is a deficient number, since it is larger than the sum of its proper divisors (459427643).

202121010109 is a wasteful number, since it uses less digits than its factorization.

202121010109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45887.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 202121010109 in words is "two hundred two billion, one hundred twenty-one million, ten thousand, one hundred nine".