21055244307 has 16 divisors (see below), whose sum is σ = 29556543360. Its totient is φ = 13295653632.

The previous prime is 21055244297. The next prime is 21055244321. The reversal of 21055244307 is 70344255012.

It is not a de Polignac number, because 21055244307 - 2⁴ = 21055244291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21055244347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318228 + ... + 378654.

It is an arithmetic number, because the mean of its divisors is an integer number (1847283960).

Almost surely, 2^21055244307 is an apocalyptic number.

21055244307 is a deficient number, since it is larger than the sum of its proper divisors (8501299053).

21055244307 is a wasteful number, since it uses less digits than its factorization.

21055244307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66562.

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

Adding to 21055244307 its reverse (70344255012), we get a palindrome (91399499319).

The spelling of 21055244307 in words is "twenty-one billion, fifty-five million, two hundred forty-four thousand, three hundred seven".