121120100021 has 8 divisors (see below), whose sum is σ = 124150576704. Its totient is φ = 118093258080.

The previous prime is 121120099987. The next prime is 121120100027. The reversal of 121120100021 is 120001021121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121120100021 - 2¹⁰ = 121120098997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121120099975 and 121120100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120100027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 841145 + ... + 974558.

It is an arithmetic number, because the mean of its divisors is an integer number (15518822088).

Almost surely, 2^121120100021 is an apocalyptic number.

It is an amenable number.

121120100021 is a deficient number, since it is larger than the sum of its proper divisors (3030476683).

121120100021 is a wasteful number, since it uses less digits than its factorization.

121120100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1817371.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121120100021 its reverse (120001021121), we get a palindrome (241121121142).

The spelling of 121120100021 in words is "one hundred twenty-one billion, one hundred twenty million, one hundred thousand, twenty-one".