121111001021021 has 4 divisors (see below), whose sum is σ = 132121092022944. Its totient is φ = 110100910019100.

The previous prime is 121111001020991. The next prime is 121111001021029. The reversal of 121111001021021 is 120120100111121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-121111001021021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111001020987 and 121111001021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111001021029) 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, 5505045500945 + ... + 5505045500966.

It is an arithmetic number, because the mean of its divisors is an integer number (33030273005736).

Almost surely, 2^{121111001021021} is an apocalyptic number.

121111001021021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121111001021021 is a deficient number, since it is larger than the sum of its proper divisors (11010091001923).

121111001021021 is a wasteful number, since it uses less digits than its factorization.

121111001021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010091001922.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 121111001021021 its reverse (120120100111121), we get a palindrome (241231101132142).

The spelling of 121111001021021 in words is "one hundred twenty-one trillion, one hundred eleven billion, one million, twenty-one thousand, twenty-one".