121200023021 has 16 divisors (see below), whose sum is σ = 151119475200. Its totient is φ = 94433480880.

The previous prime is 121200023017. The next prime is 121200023069. The reversal of 121200023021 is 120320002121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121200023021 - 2² = 121200023017 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 = 121200022987 and 121200023005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200023071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 932210 + ... + 1054236.

It is an arithmetic number, because the mean of its divisors is an integer number (9444967200).

Almost surely, 2^121200023021 is an apocalyptic number.

121200023021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121200023021 is a deficient number, since it is larger than the sum of its proper divisors (29919452179).

121200023021 is a wasteful number, since it uses less digits than its factorization.

121200023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134944.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 121200023021 its reverse (120320002121), we get a palindrome (241520025142).

The spelling of 121200023021 in words is "one hundred twenty-one billion, two hundred million, twenty-three thousand, twenty-one".