121100000021 has 64 divisors (see below), whose sum is σ = 172395578880. Its totient is φ = 81869045760.

The previous prime is 121099999981. The next prime is 121100000051. The reversal of 121100000021 is 120000001121.

It is a cyclic number.

It is not a de Polignac number, because 121100000021 - 2¹⁰ = 121099998997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121099999954 and 121100000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100000051) 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 63 ways as a sum of consecutive naturals, for example, 13558085 + ... + 13567013.

It is an arithmetic number, because the mean of its divisors is an integer number (2693680920).

Almost surely, 2^121100000021 is an apocalyptic number.

121100000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121100000021 is a deficient number, since it is larger than the sum of its proper divisors (51295578859).

121100000021 is a wasteful number, since it uses less digits than its factorization.

121100000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9774.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 121100000021 its reverse (120000001121), we get a palindrome (241100001142).

The spelling of 121100000021 in words is "one hundred twenty-one billion, one hundred million, twenty-one", and thus it is an aban number.