121001010111 has 10 divisors (see below), whose sum is σ = 180754595472. Its totient is φ = 80667340020.

The previous prime is 121001010101. The next prime is 121001010157. The reversal of 121001010111 is 111010100121.

It is not a de Polignac number, because 121001010111 - 2²⁶ = 120933901247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 121001010093 and 121001010102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001010101) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 746919735 + ... + 746919896.

Almost surely, 2^121001010111 is an apocalyptic number.

121001010111 is a deficient number, since it is larger than the sum of its proper divisors (59753585361).

121001010111 is an equidigital number, since it uses as much as digits as its factorization.

121001010111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493839643 (or 1493839634 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 121001010111 its reverse (111010100121), we get a palindrome (232011110232).

The spelling of 121001010111 in words is "one hundred twenty-one billion, one million, ten thousand, one hundred eleven".