10211202121 has 4 divisors (see below), whose sum is σ = 10238578372. Its totient is φ = 10183825872.

The previous prime is 10211202109. The next prime is 10211202161. The reversal of 10211202121 is 12120211201.

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 2339076496 + 7872125625 = 48364^2 + 88725^2 .

It is a cyclic number.

It is not a de Polignac number, because 10211202121 - 2¹¹ = 10211200073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10211202161) 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, 13687566 + ... + 13688311.

It is an arithmetic number, because the mean of its divisors is an integer number (2559644593).

Almost surely, 2^10211202121 is an apocalyptic number.

It is an amenable number.

10211202121 is a deficient number, since it is larger than the sum of its proper divisors (27376251).

10211202121 is an equidigital number, since it uses as much as digits as its factorization.

10211202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27376250.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10211202121 its reverse (12120211201), we get a palindrome (22331413322).

The spelling of 10211202121 in words is "ten billion, two hundred eleven million, two hundred two thousand, one hundred twenty-one".