21302200123 has 4 divisors (see below), whose sum is σ = 21443274448. Its totient is φ = 21161125800.

The previous prime is 21302200091. The next prime is 21302200133. The reversal of 21302200123 is 32100220312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21302200123 - 2⁵ = 21302200091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302200097 and 21302200106.

It is not an unprimeable number, because it can be changed into a prime (21302200133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70536936 + ... + 70537237.

It is an arithmetic number, because the mean of its divisors is an integer number (5360818612).

Almost surely, 2^21302200123 is an apocalyptic number.

21302200123 is a deficient number, since it is larger than the sum of its proper divisors (141074325).

21302200123 is a wasteful number, since it uses less digits than its factorization.

21302200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141074324.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21302200123 its reverse (32100220312), we get a palindrome (53402420435).

The spelling of 21302200123 in words is "twenty-one billion, three hundred two million, two hundred thousand, one hundred twenty-three".