121021200121 has 4 divisors (see below), whose sum is σ = 121026605392. Its totient is φ = 121015794852.

The previous prime is 121021200109. The next prime is 121021200137. The reversal of 121021200121 is 121002120121.

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 cyclic number.

It is not a de Polignac number, because 121021200121 - 2⁷ = 121021199993 is a prime.

It is a super-2 number, since 2×121021200121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121021200101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2668911 + ... + 2713876.

It is an arithmetic number, because the mean of its divisors is an integer number (30256651348).

Almost surely, 2^121021200121 is an apocalyptic number.

It is an amenable number.

121021200121 is a deficient number, since it is larger than the sum of its proper divisors (5405271).

121021200121 is an equidigital number, since it uses as much as digits as its factorization.

121021200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5405270.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121021200121 its reverse (121002120121), we get a palindrome (242023320242).

The spelling of 121021200121 in words is "one hundred twenty-one billion, twenty-one million, two hundred thousand, one hundred twenty-one".