21306053214123 has 8 divisors (see below), whose sum is σ = 28565021621136. Its totient is φ = 14125560141600.

The previous prime is 21306053214119. The next prime is 21306053214293. The reversal of 21306053214123 is 32141235060312.

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

It is not a de Polignac number, because 21306053214123 - 2² = 21306053214119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21306053214023) 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, 19618832988 + ... + 19618834073.

It is an arithmetic number, because the mean of its divisors is an integer number (3570627702642).

Almost surely, 2^{21306053214123} is an apocalyptic number.

21306053214123 is a deficient number, since it is larger than the sum of its proper divisors (7258968407013).

21306053214123 is a wasteful number, since it uses less digits than its factorization.

21306053214123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39237667245.

The product of its (nonzero) digits is 25920, while the sum is 33.

Adding to 21306053214123 its reverse (32141235060312), we get a palindrome (53447288274435).

The spelling of 21306053214123 in words is "twenty-one trillion, three hundred six billion, fifty-three million, two hundred fourteen thousand, one hundred twenty-three".