121111101021 has 16 divisors (see below), whose sum is σ = 170998430400. Its totient is φ = 75983255808.

The previous prime is 121111101017. The next prime is 121111101047. The reversal of 121111101021 is 120101111121.

It is not a de Polignac number, because 121111101021 - 2² = 121111101017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121111100988 and 121111101006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111101011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382375 + ... + 623243.

It is an arithmetic number, because the mean of its divisors is an integer number (10687401900).

Almost surely, 2^121111101021 is an apocalyptic number.

It is an amenable number.

121111101021 is a deficient number, since it is larger than the sum of its proper divisors (49887329379).

121111101021 is a wasteful number, since it uses less digits than its factorization.

121111101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250748.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121111101021 its reverse (120101111121), we get a palindrome (241212212142).

The spelling of 121111101021 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred one thousand, twenty-one".