21301302123 has 6 divisors (see below), whose sum is σ = 30768547524. Its totient is φ = 14200868076.

The previous prime is 21301302119. The next prime is 21301302131. The reversal of 21301302123 is 32120310312.

It is not a de Polignac number, because 21301302123 - 2² = 21301302119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301302096 and 21301302105.

It is not an unprimeable number, because it can be changed into a prime (21301302103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183405665 + ... + 1183405682.

It is an arithmetic number, because the mean of its divisors is an integer number (5128091254).

Almost surely, 2^21301302123 is an apocalyptic number.

21301302123 is a deficient number, since it is larger than the sum of its proper divisors (9467245401).

21301302123 is a wasteful number, since it uses less digits than its factorization.

21301302123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366811353 (or 2366811350 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21301302123 its reverse (32120310312), we get a palindrome (53421612435).

The spelling of 21301302123 in words is "twenty-one billion, three hundred one million, three hundred two thousand, one hundred twenty-three".