21723054225 has 24 divisors (see below), whose sum is σ = 35921263392. Its totient is φ = 11583753600.

The previous prime is 21723054209. The next prime is 21723054251. The reversal of 21723054225 is 52245032712.

It is not a de Polignac number, because 21723054225 - 2⁴ = 21723054209 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 529294 + ... + 568856.

It is an arithmetic number, because the mean of its divisors is an integer number (1496719308).

Almost surely, 2^21723054225 is an apocalyptic number.

21723054225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21723054225 is a deficient number, since it is larger than the sum of its proper divisors (14198209167).

21723054225 is a wasteful number, since it uses less digits than its factorization.

21723054225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46897 (or 46892 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

Adding to 21723054225 its reverse (52245032712), we get a palindrome (73968086937).

The spelling of 21723054225 in words is "twenty-one billion, seven hundred twenty-three million, fifty-four thousand, two hundred twenty-five".