10111210121 has 4 divisors (see below), whose sum is σ = 10357825044. Its totient is φ = 9864595200.

The previous prime is 10111210117. The next prime is 10111210133. The reversal of 10111210121 is 12101211101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12101211101 = 7 ⋅1728744443.

It can be written as a sum of positive squares in 2 ways, for example, as 2093977600 + 8017232521 = 45760^2 + 89539^2 .

It is a cyclic number.

It is not a de Polignac number, because 10111210121 - 2² = 10111210117 is a prime.

It is a super-2 number, since 2×10111210121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10111210321) 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, 123307400 + ... + 123307481.

It is an arithmetic number, because the mean of its divisors is an integer number (2589456261).

Almost surely, 2^10111210121 is an apocalyptic number.

It is an amenable number.

10111210121 is a deficient number, since it is larger than the sum of its proper divisors (246614923).

10111210121 is an equidigital number, since it uses as much as digits as its factorization.

10111210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246614922.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 10111210121 its reverse (12101211101), we get a palindrome (22212421222).

The spelling of 10111210121 in words is "ten billion, one hundred eleven million, two hundred ten thousand, one hundred twenty-one".