21000201102121 has 16 divisors (see below), whose sum is σ = 21660612196608. Its totient is φ = 20347108905600.

The previous prime is 21000201102107. The next prime is 21000201102137. The reversal of 21000201102121 is 12120110200012.

It is a cyclic number.

It is not a de Polignac number, because 21000201102121 - 2¹⁷ = 21000200971049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000201102421) 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 15 ways as a sum of consecutive naturals, for example, 4801216 + ... + 8065486.

It is an arithmetic number, because the mean of its divisors is an integer number (1353788262288).

Almost surely, 2^{21000201102121} is an apocalyptic number.

It is an amenable number.

21000201102121 is a deficient number, since it is larger than the sum of its proper divisors (660411094487).

21000201102121 is a wasteful number, since it uses less digits than its factorization.

21000201102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3265392.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21000201102121 its reverse (12120110200012), we get a palindrome (33120311302133).

The spelling of 21000201102121 in words is "twenty-one trillion, two hundred one million, one hundred two thousand, one hundred twenty-one".