21000121000122 has 32 divisors (see below), whose sum is σ = 45886526815680. Its totient is φ = 6354217336320.

The previous prime is 21000121000091. The next prime is 21000121000163. The reversal of 21000121000122 is 22100012100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000121000098 and 21000121000107.

It is an unprimeable number.

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, 236347597 + ... + 236436432.

It is an arithmetic number, because the mean of its divisors is an integer number (1433953962990).

Almost surely, 2^{21000121000122} is an apocalyptic number.

21000121000122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000121000122 is an abundant number, since it is smaller than the sum of its proper divisors (24886405815558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000121000122 is a wasteful number, since it uses less digits than its factorization.

21000121000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472784718.

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

Adding to 21000121000122 its reverse (22100012100012), we get a palindrome (43100133100134).

It can be divided in two parts, 2100012100012 and 2, that multiplied together give a palindrome (4200024200024).

The spelling of 21000121000122 in words is "twenty-one trillion, one hundred twenty-one million, one hundred twenty-two", and thus it is an aban number.