121210000021 has 8 divisors (see below), whose sum is σ = 132696334944. Its totient is φ = 109801539120.

The previous prime is 121209999991. The next prime is 121210000033. The reversal of 121210000021 is 120000012121.

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 121210000021 - 2¹¹ = 121209997973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121209999962 and 121210000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121210000081) 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 7 ways as a sum of consecutive naturals, for example, 19465246 + ... + 19471471.

It is an arithmetic number, because the mean of its divisors is an integer number (16587041868).

Almost surely, 2^121210000021 is an apocalyptic number.

121210000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121210000021 is a deficient number, since it is larger than the sum of its proper divisors (11486334923).

121210000021 is a wasteful number, since it uses less digits than its factorization.

121210000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38937011.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 121210000021 its reverse (120000012121), we get a palindrome (241210012142).

The spelling of 121210000021 in words is "one hundred twenty-one billion, two hundred ten million, twenty-one", and thus it is an aban number.