21202111000123 has 16 divisors (see below), whose sum is σ = 21695457026880. Its totient is φ = 20712409001856.

The previous prime is 21202111000097. The next prime is 21202111000129. The reversal of 21202111000123 is 32100011120212.

It is a cyclic number.

It is not a de Polignac number, because 21202111000123 - 2²⁵ = 21202077445691 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202111000097 and 21202111000106.

It is not an unprimeable number, because it can be changed into a prime (21202111000129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10815298 + ... + 12624376.

It is an arithmetic number, because the mean of its divisors is an integer number (1355966064180).

Almost surely, 2^{21202111000123} is an apocalyptic number.

21202111000123 is a deficient number, since it is larger than the sum of its proper divisors (493346026757).

21202111000123 is a wasteful number, since it uses less digits than its factorization.

21202111000123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810086.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21202111000123 its reverse (32100011120212), we get a palindrome (53302122120335).

The spelling of 21202111000123 in words is "twenty-one trillion, two hundred two billion, one hundred eleven million, one hundred twenty-three", and thus it is an aban number.