121121201112021 has 24 divisors (see below), whose sum is σ = 190858450498560. Its totient is φ = 73406480760000.

The previous prime is 121121201112019. The next prime is 121121201112031. The reversal of 121121201112021 is 120211102121121.

It is a happy number.

It is not a de Polignac number, because 121121201112021 - 2¹ = 121121201112019 is a prime.

It is a super-3 number, since 3×121121201112021³ (a number of 43 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121121201111985 and 121121201112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121201112001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22384785 + ... + 27263913.

It is an arithmetic number, because the mean of its divisors is an integer number (7952435437440).

Almost surely, 2^{121121201112021} is an apocalyptic number.

121121201112021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121201112021 is a deficient number, since it is larger than the sum of its proper divisors (69737249386539).

121121201112021 is a wasteful number, since it uses less digits than its factorization.

121121201112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129897 (or 5129894 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121121201112021 its reverse (120211102121121), we get a palindrome (241332303233142).

The spelling of 121121201112021 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred one million, one hundred twelve thousand, twenty-one".