21241440245 has 16 divisors (see below), whose sum is σ = 27201650688. Its totient is φ = 15867613440.

The previous prime is 21241440229. The next prime is 21241440247. The reversal of 21241440245 is 54204414212.

It is a happy number.

It is not a de Polignac number, because 21241440245 - 2⁴ = 21241440229 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 (21241440247) 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, 973061 + ... + 994650.

It is an arithmetic number, because the mean of its divisors is an integer number (1700103168).

Almost surely, 2^21241440245 is an apocalyptic number.

It is an amenable number.

21241440245 is a deficient number, since it is larger than the sum of its proper divisors (5960210443).

21241440245 is a wasteful number, since it uses less digits than its factorization.

21241440245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967860.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 21241440245 its reverse (54204414212), we get a palindrome (75445854457).

The spelling of 21241440245 in words is "twenty-one billion, two hundred forty-one million, four hundred forty thousand, two hundred forty-five".