12121020111 has 8 divisors (see below), whose sum is σ = 17112028464. Its totient is φ = 7605345920.

The previous prime is 12121020089. The next prime is 12121020133. The reversal of 12121020111 is 11102012121.

It is an interprime number because it is at equal distance from previous prime (12121020089) and next prime (12121020133).

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

It is a cyclic number.

It is not a de Polignac number, because 12121020111 - 2¹⁵ = 12120987343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121020011) 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, 118833480 + ... + 118833581.

It is an arithmetic number, because the mean of its divisors is an integer number (2139003558).

Almost surely, 2^12121020111 is an apocalyptic number.

12121020111 is a deficient number, since it is larger than the sum of its proper divisors (4991008353).

12121020111 is a wasteful number, since it uses less digits than its factorization.

12121020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237667081.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 12121020111 its reverse (11102012121), we get a palindrome (23223032232).

The spelling of 12121020111 in words is "twelve billion, one hundred twenty-one million, twenty thousand, one hundred eleven".