21320225047 has 24 divisors (see below), whose sum is σ = 23579272080. Its totient is φ = 19262812800.

The previous prime is 21320225029. The next prime is 21320225051. The reversal of 21320225047 is 74052202312.

It is a de Polignac number, because none of the positive numbers 2^k-21320225047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320225057) 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, 21046113 + ... + 21047125.

It is an arithmetic number, because the mean of its divisors is an integer number (982469670).

Almost surely, 2^21320225047 is an apocalyptic number.

21320225047 is a deficient number, since it is larger than the sum of its proper divisors (2259047033).

21320225047 is a wasteful number, since it uses less digits than its factorization.

21320225047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935 (or 1924 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

Adding to 21320225047 its reverse (74052202312), we get a palindrome (95372427359).

The spelling of 21320225047 in words is "twenty-one billion, three hundred twenty million, two hundred twenty-five thousand, forty-seven".