21415144245 has 64 divisors (see below), whose sum is σ = 39714831360. Its totient is φ = 9744537600.

The previous prime is 21415144199. The next prime is 21415144259. The reversal of 21415144245 is 54244151412.

It is not a de Polignac number, because 21415144245 - 2⁶ = 21415144181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 303525 + ... + 367365.

It is an arithmetic number, because the mean of its divisors is an integer number (620544240).

Almost surely, 2^21415144245 is an apocalyptic number.

It is an amenable number.

21415144245 is a deficient number, since it is larger than the sum of its proper divisors (18299687115).

21415144245 is a wasteful number, since it uses less digits than its factorization.

21415144245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63986.

The product of its digits is 25600, while the sum is 33.

Adding to 21415144245 its reverse (54244151412), we get a palindrome (75659295657).

The spelling of 21415144245 in words is "twenty-one billion, four hundred fifteen million, one hundred forty-four thousand, two hundred forty-five".