21210100011123 has 24 divisors (see below), whose sum is σ = 29852489878848. Its totient is φ = 13393343679408.

The previous prime is 21210100011103. The next prime is 21210100011157. The reversal of 21210100011123 is 32111000101212.

It is not a de Polignac number, because 21210100011123 - 2⁸ = 21210100010867 is a prime.

It is a super-2 number, since 2×21210100011123² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21210100011103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3959440 + ... + 7622162.

It is an arithmetic number, because the mean of its divisors is an integer number (1243853744952).

Almost surely, 2^{21210100011123} is an apocalyptic number.

21210100011123 is a deficient number, since it is larger than the sum of its proper divisors (8642389867725).

21210100011123 is a wasteful number, since it uses less digits than its factorization.

21210100011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668111 (or 3668092 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21210100011123 its reverse (32111000101212), we get a palindrome (53321100112335).

The spelling of 21210100011123 in words is "twenty-one trillion, two hundred ten billion, one hundred million, eleven thousand, one hundred twenty-three".