10202121212021 has 8 divisors (see below), whose sum is σ = 10403629404120. Its totient is φ = 10000946921472.

The previous prime is 10202121211999. The next prime is 10202121212027. The reversal of 10202121212021 is 12021212120201.

It can be written as a sum of positive squares in 4 ways, for example, as 1105050873796 + 9097070338225 = 1051214^2 + 3016135^2 .

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 10202121212021 - 2⁶ = 10202121211957 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 (10202121212027) 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, 83413676 + ... + 83535893.

It is an arithmetic number, because the mean of its divisors is an integer number (1300453675515).

Almost surely, 2^{10202121212021} is an apocalyptic number.

It is an amenable number.

10202121212021 is a deficient number, since it is larger than the sum of its proper divisors (201508192099).

10202121212021 is a wasteful number, since it uses less digits than its factorization.

10202121212021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166950775.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 10202121212021 its reverse (12021212120201), we get a palindrome (22223333332222).

The spelling of 10202121212021 in words is "ten trillion, two hundred two billion, one hundred twenty-one million, two hundred twelve thousand, twenty-one".