21101302122123 has 8 divisors (see below), whose sum is σ = 28135090939600. Its totient is φ = 14067524026368.

The previous prime is 21101302122107. The next prime is 21101302122151. The reversal of 21101302122123 is 32122120310112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21101302122123 - 2⁴ = 21101302122107 is a prime.

It is a super-2 number, since 2×21101302122123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21101302122123.

It is not an unprimeable number, because it can be changed into a prime (21101302120123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5341323 + ... + 8410251.

It is an arithmetic number, because the mean of its divisors is an integer number (3516886367450).

Almost surely, 2^{21101302122123} is an apocalyptic number.

21101302122123 is a deficient number, since it is larger than the sum of its proper divisors (7033788817477).

21101302122123 is a wasteful number, since it uses less digits than its factorization.

21101302122123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360861.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21101302122123 its reverse (32122120310112), we get a palindrome (53223422432235).

The spelling of 21101302122123 in words is "twenty-one trillion, one hundred one billion, three hundred two million, one hundred twenty-two thousand, one hundred twenty-three".