10202122012121 has 4 divisors (see below), whose sum is σ = 10986900628452. Its totient is φ = 9417343395792.

The previous prime is 10202122012091. The next prime is 10202122012153. The reversal of 10202122012121 is 12121022120201.

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 1864696760521 + 8337425251600 = 1365539^2 + 2887460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10202122012121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10202122012121.

It is not an unprimeable number, because it can be changed into a prime (10202122012721) 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, 392389308146 + ... + 392389308171.

It is an arithmetic number, because the mean of its divisors is an integer number (2746725157113).

Almost surely, 2^{10202122012121} is an apocalyptic number.

It is an amenable number.

10202122012121 is a deficient number, since it is larger than the sum of its proper divisors (784778616331).

10202122012121 is an equidigital number, since it uses as much as digits as its factorization.

10202122012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784778616330.

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

Adding to 10202122012121 its reverse (12121022120201), we get a palindrome (22323144132322).

The spelling of 10202122012121 in words is "ten trillion, two hundred two billion, one hundred twenty-two million, twelve thousand, one hundred twenty-one".