121121101121111 has 32 divisors (see below), whose sum is σ = 159289156414080. Its totient is φ = 89367422570496.

The previous prime is 121121101121107. The next prime is 121121101121143. The reversal of 121121101121111 is 111121101121121.

It is a happy number.

It is not a de Polignac number, because 121121101121111 - 2² = 121121101121107 is a prime.

It is a super-2 number, since 2×121121101121111² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 121121101121111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121101121101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 358979006 + ... + 359316251.

It is an arithmetic number, because the mean of its divisors is an integer number (4977786137940).

Almost surely, 2^{121121101121111} is an apocalyptic number.

121121101121111 is a deficient number, since it is larger than the sum of its proper divisors (38168055292969).

121121101121111 is a wasteful number, since it uses less digits than its factorization.

121121101121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718295403.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 121121101121111 its reverse (111121101121121), we get a palindrome (232242202242232).

The spelling of 121121101121111 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-one thousand, one hundred eleven".