121111021021 has 16 divisors (see below), whose sum is σ = 124150924800. Its totient is φ = 118111593600.

The previous prime is 121111021001. The next prime is 121111021033. The reversal of 121111021021 is 120120111121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121111021021 - 2²¹ = 121108923869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111020992 and 121111021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111021001) 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, 7170216 + ... + 7187086.

It is an arithmetic number, because the mean of its divisors is an integer number (7759432800).

Almost surely, 2^121111021021 is an apocalyptic number.

It is an amenable number.

121111021021 is a deficient number, since it is larger than the sum of its proper divisors (3039903779).

121111021021 is a wasteful number, since it uses less digits than its factorization.

121111021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18060.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121111021021 its reverse (120120111121), we get a palindrome (241231132142).

The spelling of 121111021021 in words is "one hundred twenty-one billion, one hundred eleven million, twenty-one thousand, twenty-one".