121200012021 has 16 divisors (see below), whose sum is σ = 176296785408. Its totient is φ = 73452111600.

The previous prime is 121200011957. The next prime is 121200012053. The reversal of 121200012021 is 120210002121.

It is not a de Polignac number, because 121200012021 - 2⁶ = 121200011957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121200011988 and 121200012006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200019021) 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, 1742310 + ... + 1810536.

It is an arithmetic number, because the mean of its divisors is an integer number (11018549088).

Almost surely, 2^121200012021 is an apocalyptic number.

121200012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121200012021 is a deficient number, since it is larger than the sum of its proper divisors (55096773387).

121200012021 is a wasteful number, since it uses less digits than its factorization.

121200012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122072.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121200012021 its reverse (120210002121), we get a palindrome (241410014142).

The spelling of 121200012021 in words is "one hundred twenty-one billion, two hundred million, twelve thousand, twenty-one".