10111212121 has 8 divisors (see below), whose sum is σ = 10644847200. Its totient is φ = 9577723680.

The previous prime is 10111212119. The next prime is 10111212127. The reversal of 10111212121 is 12121211101.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 10111212121 - 2¹ = 10111212119 is a prime.

It is a super-4 number, since 4×10111212121⁴ (a number of 41 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10111212127) 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, 122685 + ... + 187813.

It is an arithmetic number, because the mean of its divisors is an integer number (1330605900).

Almost surely, 2^10111212121 is an apocalyptic number.

It is an amenable number.

10111212121 is a deficient number, since it is larger than the sum of its proper divisors (533635079).

10111212121 is an equidigital number, since it uses as much as digits as its factorization.

10111212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73319.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10111212121 its reverse (12121211101), we get a palindrome (22232423222).

The spelling of 10111212121 in words is "ten billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".