121004402111 has 4 divisors (see below), whose sum is σ = 122251870272. Its totient is φ = 119756933952.

The previous prime is 121004402053. The next prime is 121004402137. The reversal of 121004402111 is 111204400121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111204400121 = 25523 ⋅4357027.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121004402111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121004402111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121004402161) 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, 623733935 + ... + 623734128.

It is an arithmetic number, because the mean of its divisors is an integer number (30562967568).

Almost surely, 2^121004402111 is an apocalyptic number.

121004402111 is a deficient number, since it is larger than the sum of its proper divisors (1247468161).

121004402111 is an equidigital number, since it uses as much as digits as its factorization.

121004402111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247468160.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121004402111 its reverse (111204400121), we get a palindrome (232208802232).

The spelling of 121004402111 in words is "one hundred twenty-one billion, four million, four hundred two thousand, one hundred eleven".