10202020122121 has 6 divisors (see below), whose sum is σ = 10837440060830. Its totient is φ = 9601901291136.

The previous prime is 10202020122097. The next prime is 10202020122197. The reversal of 10202020122121 is 12122102020201.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 5075468294400 + 5126551827721 = 2252880^2 + 2264189^2 .

It is not a de Polignac number, because 10202020122121 - 2¹⁷ = 10202019991049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202020122095 and 10202020122104.

It is not an unprimeable number, because it can be changed into a prime (10202020132121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17650553556 + ... + 17650554133.

Almost surely, 2^{10202020122121} is an apocalyptic number.

It is an amenable number.

10202020122121 is a deficient number, since it is larger than the sum of its proper divisors (635419938709).

10202020122121 is an equidigital number, since it uses as much as digits as its factorization.

10202020122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35301107723 (or 35301107706 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10202020122121 its reverse (12122102020201), we get a palindrome (22324122142322).

The spelling of 10202020122121 in words is "ten trillion, two hundred two billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".