21000121100222 has 16 divisors (see below), whose sum is σ = 34363986903792. Its totient is φ = 9545467264320.

The previous prime is 21000121100221. The next prime is 21000121100237. The reversal of 21000121100222 is 22200112100012.

It is a junction number, because it is equal to n+sod(n) for n = 21000121100197 and 21000121100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000121100221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3261548 + ... + 7255200.

It is an arithmetic number, because the mean of its divisors is an integer number (2147749181487).

Almost surely, 2^{21000121100222} is an apocalyptic number.

21000121100222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000121100222 is a deficient number, since it is larger than the sum of its proper divisors (13363865803570).

21000121100222 is a wasteful number, since it uses less digits than its factorization.

21000121100222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4232683.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21000121100222 its reverse (22200112100012), we get a palindrome (43200233200234).

The spelling of 21000121100222 in words is "twenty-one trillion, one hundred twenty-one million, one hundred thousand, two hundred twenty-two".