10121202121 has 4 divisors (see below), whose sum is σ = 10447692544. Its totient is φ = 9794711700.

The previous prime is 10121202109. The next prime is 10121202139. The reversal of 10121202121 is 12120212101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12120212101 = 17 ⋅712953653.

It is a cyclic number.

It is not a de Polignac number, because 10121202121 - 2⁹ = 10121201609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10121203121) 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, 163245165 + ... + 163245226.

It is an arithmetic number, because the mean of its divisors is an integer number (2611923136).

Almost surely, 2^10121202121 is an apocalyptic number.

It is an amenable number.

10121202121 is a deficient number, since it is larger than the sum of its proper divisors (326490423).

10121202121 is an equidigital number, since it uses as much as digits as its factorization.

10121202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326490422.

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

Adding to 10121202121 its reverse (12120212101), we get a palindrome (22241414222).

The spelling of 10121202121 in words is "ten billion, one hundred twenty-one million, two hundred two thousand, one hundred twenty-one".