10202020101221 has 8 divisors (see below), whose sum is σ = 11056770440184. Its totient is φ = 9357266842560.

The previous prime is 10202020101193. The next prime is 10202020101293. The reversal of 10202020101221 is 12210102020201.

It can be written as a sum of positive squares in 4 ways, for example, as 2069313897121 + 8132706204100 = 1438511^2 + 2851790^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-10202020101221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202020101196 and 10202020101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202020103221) 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 7 ways as a sum of consecutive naturals, for example, 2499267950 + ... + 2499272031.

It is an arithmetic number, because the mean of its divisors is an integer number (1382096305023).

Almost surely, 2^{10202020101221} is an apocalyptic number.

It is an amenable number.

10202020101221 is a deficient number, since it is larger than the sum of its proper divisors (854750338963).

10202020101221 is a wasteful number, since it uses less digits than its factorization.

10202020101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4998540151.

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

Adding to 10202020101221 its reverse (12210102020201), we get a palindrome (22412122121422).

The spelling of 10202020101221 in words is "ten trillion, two hundred two billion, twenty million, one hundred one thousand, two hundred twenty-one".